The Disney film starring Aaron Pierre, Kelvin Harrison Jr., Blue Ivy Carter, Seth Rogen and more, hits theaters Dec. 20

"They try to keep the cast as far away from us as possible," Eichner tells PEOPLE exclusively

Barry Jenkins talked about working with the 12-year-old while at the L.A. premiere of the film on Dec. 9

The preteen, who stars in the Disney animated film alongside mom Beyoncé, wore a head-turning metallic gown on the carpet

The singer was joined at the premiere by her stylish tween daughter Blue Ivy Carter, who also stars in the Disney animated film

Beyoncé and her daughter Blue Ivy Carter star in the new Disney prequel ‘Mufasa: The Lion King’

Beyoncé and her daughter Blue Ivy Carter star in the new Disney prequel ‘Mufasa: The Lion King’

Beyoncé and Jay-Z share three children: 12-year-old daughter Blue Ivy and twins Rumi and Sir, 7