The drama between Blake Lively and Justin Baldoni, who played Lily and Ryle in the 2024 adaptation of the Colleen Hoover novel "It Ends With Us," quickly went from rumors to a matter of legal record.

There were first whispers of a feud when it became clear that Baldoni (who also directed the film) wasn't doing press or appearing on the red carpet with any other members of the cast.

But in December, months after the film was released, things got messier. Lively filed a legal complaint against Baldoni, accusing him of "sexual harassment, retaliation, and coordinating attempts to damage her reputation." Baldoni's lawyer called the claims "categorically false."

A few weeks later, in January, Baldoni sued Lively and her husband, Ryan Reynolds, asking for $400 million in damages and claiming that the two had conspired to destroy his reputation.

"The strategy of attacking the woman is desperate, it does not refute the evidence in Ms. Lively's complaint, and it will fail," Lively's legal team said in a statement to BI.

With the trial set for 2026, this won't be the last we hear about this feud.

"Dirty Dancing," released in 1987, is a classic romance film, and Johnny (Swayze) and Baby (Grey) are one of the most beloved on-screen couples ever. However, while their on-screen chemistry was undeniable, their real relationship was a bit rocky.

"She'd slip into silly moods, forcing us to do scenes over and over," Swayze wrote in his 2010 memoir, "The Time of My Life." He added, "She seemed particularly emotional, sometimes bursting into tears if someone criticized her."

In her 2022 memoir, "Out of the Corner," Grey confirmed their turbulent relationship, which had begun before "Dirty Dancing" started shooting. She said she wasn't impressed by his behavior when they filmed the 1984 action film "Red Dawn." 

"'Please, no. Not him. Anybody else. Please!' I begged," Grey wrote when she heard of Swayze's casting. 

But in an interview on "The View" in May 2022, she said during the screen test he convinced her to change her mind about him.

"He pulled me down the hall and said to me, 'I love you, I love you and I'm so sorry. I know you don't want me to do the movie,'" Grey said.

Still, filming together turned out to be a challenge. 

"The sexual chemistry between Baby and Johnny was everything, and I was not feeling it. How was I supposed to trust this guy?" she wrote in her memoir. "I couldn't help but sense Patrick's impatience with me in rehearsals. It freaked me out to feel I'd finally gotten it with Kenny [Ortega, the film's choreographer] and was ready to go, only to find out that with Patrick, I didn't have it at all."

"The tension between us fed a certain real-life struggle and energy into the movie," she added.

In an April 2022 interview with People she shared her regrets about the relationship with Swayze, who died in 2009.

"I feel like if I could say anything to him now I would say, 'I'm so sorry that I couldn't just appreciate and luxuriate in who you were, instead of me wishing you were more like what I wanted you to be,'" Grey said. 

Thankfully, the two are close now, but according to Dobrev, the on-screen lovers couldn't stand each other for the first five months of filming their show in 2009, while their characters were falling madly in love. She even admitted she and costar Paul Wesley "despised each other" at the beginning of the show.

"I respected Paul Wesley, I didn't like Paul Wesley," Dobrev revealed on the "Directionally Challenged" podcast in June 2019. Cue the sounds of "Stelena" fans' hearts breaking all over the world.

"But, of everyone [from the 'Vampire Diaries' cast], I think I probably see him the most and hang out with him the most … We are probably the closest. We hang out a lot. We're really good friends,
she said. "It's so funny how time changes everything because I never thought that he would be one of my best friends," she continued.

Their characters had a similar up-and-down dynamic — the two dated for three and a half seasons of the show before breaking up for good in season four.

The two played dueling reporters looking for a scoop on the same story before falling in love in the 1994 film "I Love Trouble," but the title seemed to mirror their off-screen dynamic a bit too well.

Trouble brewing on set led to a piece in the Los Angeles Times in 1994. Sources told the paper the two actors didn't get along and bickered incessantly.

Journalist Judy Brennan wrote, "Roberts reportedly wasn't thrilled with Nolte's machismo, so she would deride and insult her costar. Some on the set claim that he became so annoyed with her attitude that he would do things to agitate her even more. The discord was so intense, the sources say, the two played more to stand-ins than to each other."

In a 1993 interview with The New York Times that took place during filming, Roberts described her relationship with Nolte, saying: "From the moment I met him we sort of gave each other a hard time, and naturally we get on each other's nerves."

She added that while he can be "completely charming and very nice, he's also completely disgusting. He's going to hate me for saying this, but he seems to go out of his way to repel people."

Nolte responded, "It's not nice to call someone 'disgusting.' But she's not a nice person. Everyone knows that."

In 2022, Nolte told Business Insider that, while they hadn't buried the hatchet, the feud was "absurd."

"It was partly my fault and a little bit of hers. Julia got married at the beginning of that film and it was one of those things where I just approached it all wrong," he said.

Sophia Bush and Chad Michael Murray got married — and then divorced — on the set of "One Tree Hill," all while playing on-again/off-again couple Brooke and Lucas.

Murray and Bush met on the set of the teen drama and were married shortly after in 2005. Five months later, the two separated, and they were divorced in 2006. Despite that, the two continued working together, and their characters even hooked up a few more times before Murray left the show after season six in 2009.

While on "Watch What Happens Live" in 2014, Bush was asked when she last spoke to Murray and said, "My mother once said to me that if you don't have anything nice to say, not to say anything at all."

Bush was asked about the relationship again during a 2018 appearance on Andy Cohen's radio show, and she said that getting married "was not a thing I actually really wanted to do," implying the producers had a role in it.

She later said on Twitter (now X) that she had been making fun of herself during the interview.

For his part, Murray issued a statement through his rep that said, "Chad conducts himself in a completely professional manner and would never marry for any reason but love. Thirteen years since his divorce from Sophia, he has a very happy family life with his wife and children. He has completely moved on and doesn't feel the need to engage in this type of behavior."

Ryan Gosling and Rachel McAdams originally did not get along while filming "The Notebook," but then they went on to date for roughly three years.

Director Nick Cassavetes revealed that the two struggled to get along when they first started filming the 2004 movie.

"Maybe I'm not supposed to tell this story, but they were really not getting along one day on set. Really not," Cassavetes told VH1 in 2014. Gosling even asked to replace McAdams.

"Ryan came to me, and there's 150 people standing in this big scene, and he says, 'Nick come here,'" the director said. "And he's doing a scene with Rachel and he says, 'Would you take her out of here and bring in another actress to read off camera with me?' I said, 'What?' He says, 'I can't. I can't do it with her. I'm just not getting anything from this.'"

"We went into a room with a producer; they started screaming and yelling at each other. I walked out," Cassavetes added.

After allowing them to let off some steam, filming was able to continue, and their chemistry was a huge hit. Noah and Allie remain one of the most iconic couples in recent movie history.

They'd even go on to date in real life, from 2005 to 2007. They briefly reunited in 2008 before calling it quits for good.

Charlie Sheen reportedly got Selma Blair fired from "Anger Management," in which the two played friends with benefits.

The Hollywood Reporter reported Blair took issue with Sheen's work ethic and voiced her concerns, so Sheen fired Blair in 2013 via a nasty text in which he called her a vulgar name.

During a segment on "Watch What Happens Live" in January 2017, Sheen commented on his former costar, Blair, and his former "Two and a Half Men" costar, Jenny McCarthy.

"I'd like to mash those two together and then kick them to the curb," he said. "They deserve each other."

Anthony Hopkins and Shirley MacLaine costarred in "A Change of Seasons" as a feuding married couple, and in real life, they also feuded.

In the 1980 film, MacLaine plays a woman who finds out her husband (Hopkins) is cheating on her and then decides that she's going to cheat on him too, much to his chagrin.

Off-screen, things weren't any more amicable. Hopkins later called MacLaine "the most obnoxious actress I have ever worked with," per The Independent.

In 2014, when the New York Post asked if she'd work with Hopkins again, she didn't answer and instead replied that she "didn't like him either," though she did add that "he was on the wagon at that time, and it was hard on him."

There was no love lost between Lauren Graham and Scott Patterson, who played Lorelai Gilmore and Luke Danes on "Gilmore Girls."

For seven seasons of the show, fans watched as these two soulmates danced around each other, briefly dating for a season only to break up. They didn't even get back together until the series finale.

Their prickly dynamic, which made them so compelling to watch, might have been inspired by their off-screen relationship — or lack thereof. Rumors always swirled that Graham and Patterson didn't exactly like each other, and Graham confirmed they weren't the best of friends during a TV Guide interview in 2005.

"It's fine," she said of their relationship. "I think these characters have a great chemistry and that does mirror our chemistry as people. We're not intimates," Graham added. When asked if they were best friends, she responded with a simple "No."

However, they were able to recapture the magic for "Gilmore Girls: A Year in the Life," which picked up nine years after the original series ended, and reunited once again in 2024 for a "Gilmore Girls" Walmart ad, so clearly the two have a positive working relationship.

"I am amazed at what [Graham] did with this dialogue, with these massive chunks of dialogue. They were 80 pages, these scripts, and it was all black ink, and most of it said 'Lorelai.' Just an amazing performance throughout, and that's one of the things you marvel at as a fan of the show," Patterson said during a chat with Good Housekeeping in 2024.

It wasn't always fine between "X-Files" costars and iconic fictional will-they-or-won't-they couple Gillian Anderson and David Duchovny, which lasted from 1993 to 2018.

The two may have enjoyed working together since, but in the early seasons, they reportedly did butt heads on set.

Duchovny first mentioned their off-screen relationship was less-than-perfect in a 2008 interview with Metro: "We used to argue about nothing. We couldn't stand the sight of each other," he said.

In a 2015 interview with The Guardian, Anderson opened up about how the two sometimes wouldn't talk.

"I mean, yes, there were definitely periods when we hated each other," she said. "Hate is too strong a word. We didn't talk for long periods of time. It was intense."

In 2024, Anderson appeared on an episode of Duchovny's podcast, "Fail Better" and the two discussed the breakdown of their friendship.

"There was a long time, working on the show, where we were just not even dealing with one another off-camera. And there was a lot of tension," he said, and added, "I could've handled myself better, you know?"

Armie Hammer implied he was written off "Gossip Girl" at the request of a cast member, and he seemed to suggest it was on-screen love interest Blake Lively.

Hammer played Gabriel, a love interest for Lively's character Serena — the two even got married in Spain. It seemed like he'd be around for a while ... until his character was unceremoniously written off at the end of the season in 2009.

In 2017, Hammer spoke about his short stint on the show during an appearance on "Watch What Happens Live."

When asked by an audience member to name the biggest diva on set, Hammer hesitated to name names. What he did say, though, was that it "was a tough show to film, and I didn't end up actually filming all of the episodes I was supposed to because it was such a tough filming."

When host Andy Cohen asked if Hammer had asked to be written off, he replied, "It was also like, 'Get him out of here,'" implying someone else asked for him to be written off.

Fellow guest Cheslea Handler then implied that it sounded like Lively was the problem.

"No, no, that's not what I'm saying," Hammer said, but added a grin and raised his eyebrows at Handler.

However, a few years later, Hammer was involved in multiple scandals, which may, at the very least, cast doubt on his version of events.

Curtis and Monroe, who had actually dated before either became famous, played lovers in "Some Like It Hot" around a decade later in 1958. Somewhere in those 10 years, their relationship soured.

Famously, he was asked what it was like to kiss Monroe, to which he replied, "It was like kissing Hitler."

In later interviews, he said he never said it or that he was joking. He did tell The Daily Mail in 2008 that kissing her "was awful," and added, "She nearly choked me to death by deliberately sticking her tongue down my throat into my windpipe."

In 2001, he told Entertainment Weekly the star had "difficulties."

"There was nothing laid back or amusing about Marilyn on that movie. She was drinking a lot on the set," he added.

In the 1997 romantic comedy Picture Perfect, Aniston and Mohr play a fake engaged couple who eventually fall in love.

During a 2010 interview with Elle, Mohr was asked what his most awkward interaction was with a female celebrity. He responded, "Being on the set of a movie where the leading woman was unhappy with my presence and made it clear from day one."

He continued, "I hadn't done many movies, and even though they screen-tested some pretty famous guys, I somehow snaked into the leading role. The actress said, 'No way! You've got to be kidding me!' Loudly. Between takes. To other actors on set. I would literally go to my mom's house and cry."

At the time, he refused to confirm whether it was Aniston or not.

However, in 2012, during an episode of his podcast "Mohr Stories," he said Aniston had been extremely angry he had been cast. He said she told him the studio had screen-tested six guys, and they picked the one (Mohr) she had hated, over her own boyfriend at the time, Tate Donovan.

Aniston has never publicly commented on his claims.

If, as "An Officer and a Gentleman" says, that love lifts us up where we belong, its two stars Richard Gere and Debra Winger were decidedly on the ground.

In the 1982 film, Gere plays an Aviation Officer Candidate named Zack, who falls in love with Winger's Paula, a factory worker. She was later nominated for an Oscar for the film.

In real life, though, Winger wasn't fond of her costar. In fact, she called him "a brick wall" and called director Taylor Hackford "an animal."

There wasn't really any permanent hate, though. In 2002, Winger told The Guardian, "I run in to Richard Gere quite a lot and he half jokes: 'Are you still saying terrible things about me?' We had a moment in our life which was not good, but everyone has to get it into perspective."

Meryl Streep and Dustin Hoffman play feuding exes in 1979's "Kramer vs. Kramer," which seemed similar to their off-screen dynamic.

When Streep first heard about what would become the Oscar-winning 1979 film, she was mourning the death of her boyfriend, fellow actor John Cazale, who died in 1978.

According to a 2016 book about Streep's life, "Her Again: Becoming Meryl Streep," Hoffman slapped Streep across the face, taunted her about the recent death of Cazale, and even shattered a wine glass next to her without telling her. 

"He was goading her and provoking her," said producer Richard Fischoff, "using stuff that he knew about her personal life and about John to get the response that he thought she should be giving in the performance."

"All is forgiven and I really, really love him and I think he's an amazing actor, yeah, but boy I was mad that day," Streep said during a 2008 appearance on "Friday Night with Jonathan Ross."