In September 2023, Keoghan and Carpenter attended a fashion show hosted by Givenchy during Paris Fashion Week.

E! News and DailyMail.com previously reported that this is when the rumored couple first met.

On December 3, 2023, DailyMail.com published pictures of Keoghan and Carpenter together and reported they went on a dinner date in Los Angeles.

Fans were confused by this news since Keoghan had yet to confirm whether he had split from longtime girlfriend Alyson Kierans. The pair have a son, Brando, and there were unconfirmed reports that the couple split in July 2023.

In January 2024, Keoghan mentioned Kierans in a cover story for GQ magazine in a way that suggested they were more co-parents than partners.

"She's done a great job, and she's an incredible mother," Keoghan said.

People reported, citing unnamed sources, that Keoghan and Carpenter went on a date to Luna Luna, an art exhibit in LA, on January 15.

A witness told People that the pair kissed during the date. Neither addressed the dating rumor.

A month later, Carpenter and Keoghan attended W Magazine's Grammys afterparty separately, but W reported that they hung out together inside.

"Meanwhile, Barry Keoghan chatted with friends as Sabrina Carpenter perched on his lap," a W staff member wrote.

The magazine also shared a picture of the pair on Instagram.

Later that month, People reported that Carpenter and Keoghan went on two more dates in LA.

In March, Carpenter performed her last few opening-act shows for Swift's Eras Tour.

During one of Carpenter's performances in Singapore, fans noticed Keoghan in the crowd and shared videos of him.

Then, on March 10, several outlets reported that Keoghan wore a friendship bracelet with Carpenter's name on it to the Oscars.

Later in March, Carpenter refused to comment on the dating rumors during an interview with Cosmopolitan, dodging a question about her dating life.

"The relationships that I actually want to put my energy into have to be so interesting or invigorating because they take me away from the other things I love," Carpenter said. "So yeah, it's fun and it's messy. I think I'm still just at this place where I'm really enjoying the newness of all of it."

In April, Carpenter performed on both weekends at the 2024 Coachella music festival.

During the first weekend, Keoghan was in the crowd, and fans shared multiple videos of him recording Carpenter or dancing to her songs.

In a video shared on social media, Carpenter seemed to wave toward Keoghan in the crowd during her performance.

Later in the day, fans posted a video on TikTok showing Keoghan and Carpenter hanging out with Swift and her boyfriend Travis Kelce.

During the second weekend of Coachella, Carpenter made a reference to Keoghan's hit film "Saltburn" during her performance.

During the outro for Carpenter's song "Nonsense" from her 2022 album "Emails I Can't Send," Carpenter normally ad-libbed a funny, risque verse.

That time she sang: "Made his knees so weak he had to spread mine / He's drinking my bath water like it's red wine / Coachella , see you back here when I headline."

The "drinking my bath water" line seemed like a reference to a scandalous scene in "Saltburn," where Keoghan's character drinks bathwater after it has been used by the man he is obsessed with.

On May 6, Keoghan and Carpenter arrived together at the 2024 Met Gala, making their first joint appearance on a red carpet.

After the event, Vogue published a video of the pair getting ready for the gala. In the clip, Carpenter is happy to see Keoghan when he walks in, and Keoghan appears to lean in for a kiss.

A few days later, Carpenter celebrated her 25th birthday.

People reported, citing an unnamed source, that Keoghan threw her a party on May 11 in Brooklyn.

The party featured a cake with Leonardo DiCaprio's face and the caption: "Nooo don't turn 25 [you're] so sexy aha." This refers to the internet joke that DiCaprio is only attracted to women under 25.

Later in the month, Carpenter traveled to the UK for the BBC Radio 1 Weekend music festival.

Fans think they saw Keoghan backstage in a video of Carpenter's performance — pointing to a blurry figure in purple that resembles him.

Carpenter took on the dating rumors in the best way possible — casting Keoghan as her criminal boyfriend in her latest music video.

In the video for "Please Please Please," which received more than three million views in its first 14 hours, Keoghan plays a convict who keeps getting locked up for violent crimes.

In the first verse, Carpenter seems to tease Keoghan's identity, signing: "I heard that you're an actor, so act like a stand-up guy."

In the second verse, Carpenter appears to reference her initial attempt to keep her relationship with Keoghan private.

"And we could live so happily, if no-one knows that you're with me — I'm just kidding, but really," she sings.

In the video, Carpenter's character falls for him at first sight and dates him after he is out of prison. However, their relationship goes wrong because he keeps bringing her along whenever he commits a crime.

At the end of the video, Carpenter handcuffs Keoghan and puts tape around his mouth before kissing him.

On August 6, Variety asked Carpenter about Keoghan's appearance in the "Please Please Please" music video in its cover issue interview.

Carpenter did not give any details about their relationship but had a lot of praise for Keoghan.

"I don't want to sound biased, but I think he's one of the best actors of this generation. So getting to see him on the screen with my song as the soundtrack made the video better and all the more special," she said.

Carpenter also said Keoghan was a fan of the song.

"He loved the song. He's obsessed with the lyrics, and I'm so grateful for that," she said.

In the days following People's report, a rumor spread on social media that Keoghan had cheated on Carpenter with an LA-based influencer.

The rumor began after Deux Moi, the blind-item gossip account, shared an anonymous message that said an "A-list singer who's having her breakout year and her foreign boyfriend are done for good" because the boyfriend cheated on her with a "blonde, semi-famous, LA based influencer (who's particularly big on TikTok)."

Fans believed the post was about Keoghan and Carpenter and thought Brekkie Hill was the other person involved.

Keoghan deleted his Instagram account on December 7 and wrote in a statement on X: "My name has been dragged across the internet in ways I usually don't respond to. I have to respond now because it's getting to a place where there are too many lines being crossed."

Keoghan said people had turned up where his son and grandmother live.

Carpenter has not said anything about the breakup reports or cheating rumors.

In August, rumors swirled that Carpenter and Keoghan had parted ways, and an unnamed source told People that the pair had an "on-and-off" relationship.

But Keoghan dampened speculation after liking one of her Instagram photos about the release of her album "Short n' Sweet."

On December 3, People reported that the couple had separated after a year of dating, citing an unnamed source supposedly close to both celebs.

"They are both young and career-focused, so they've decided to take a break," the source said.

The report did not have any detail about the reason for the breakup, or the rumors that Keoghan had cheated on the "Please Please Please" singer.

Fans were quick to speculate that there was a bigger reason behind the split. Many looked to Deux Moi, the blind-item gossip account, which had posted a report saying the "A-list singer who's having her breakout year and her foreign boyfriend are done for good." Many took this as a reference to Carpenter and Keoghan.

The post went on to suggest that Keoghan was cheating on Carpenter with a "blonde, semi-famous, LA based influencer (who's particularly big on TikTok)."

Fans believe that Brekkie Hill, a content creator with 4.3 million followers on TikTok, is the other person involved.

In a December 7 video on TikTok, Hill said that she'd never met Keoghan.

"To put it simply for you all, no, I did not get with Barry. I have never even encountered this man in my life. The only time I've seen him is on my TV screen from watching 'Saltburn,'" she said.

Fans noted that Hill had also reposted the rumors of Keoghan cheating on her Snapchat account, something she said she did because she thought they were "ridiculous."

Hill added: "I'm sorry but if I really was the one getting with Barry, why in the world would I be reposting about it? … Coming from someone who has been cheated on … I would never want to homewreck any relationship or put any girl through that pain — ever."

Keoghan deactivated his Instagram account on December 7, and indirectly addressed the situation in a statement on X.

He said he "can only sit and take so much. My name is being dragged across the internet in ways I usually don't respond to."

The actor said that he'd received abuse online that "no person should ever have to read" regarding his looks and parenting.

He also said people had been "knocking on my grannies door" and "sitting outside my baby boys house intimidating them."

At the end of his statement, he asked fans: "Please be respectful to all."