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Mark Ruffalo Had No Clue Brie Larson Was In '13 Going On 30' — PLUS Other Child Stars You Forgot Were In The Film

Brie larson
Source: Getty

Apr. 24 2019, Updated 5:52 p.m. ET

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When 13 Going on 30 premiered in 2004, it made hearts swoon! The quintessential romantic comedy starred Mark Ruffalo and Jennifer Garner, but there were a few other now-famous faces in the film. It took 15 years for Mark to find out that his Avengers: Endgame costar Brie Larson also starred in the movie! Scroll through to see Mark's reaction and to learn which other child stars made their big-screen debuts in the flick!

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Mark, 51, was attending the Avengers: Endgame premiere on Tuesday, April 23, when he learned the news. “She was a mean girl! Oh my God, that’s amazing. Wow, I didn’t know that,” he laughed.

Revolution Studios
Source: Revolution Studios

Turns out Brie played the role of "Six Chick" in the film. But there are a few other young stars who also made appearances.

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Revolution Studios
Source: Getty

Pretty Little Liars alum Ashley Benson portrayed a "Six Chick," while Secret Life of The American Teenager star Renee Olstead was cast in a small role.

Revolution Studios
Source: Getty

Revenge star Christa B. Allen starred as the younger version of Jennifer's character. The 27-year-old would then go on to play the teen version of her again in 2009's Ghosts of Girlfriends Past.

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The iconic film celebrated its 15th anniversary on April 23 and Jennifer paid tribute with a sweet Instagram post.

Avengers Premiere
Source: Getty

Are you surprised to find out that Brie was in the film? Sound off in the comments below!

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