Mark Ruffalo had no idea Avengers co-star Brie Larson was in 13 Going on 30

Last night was the big premiere of Avengers Endgame, getting everyone even more excited for this Friday's theatrical debut. But another film stole the spotlight for a moment, when Mark Ruffalo learned that his Avengers co-star Brie Larson was also one of his co-stars in 13 Going On 30.

Skip to about 2:05 in the video below to catch his reaction!

Brie played one of the six mean girls in 13 Going On 30, which is celebrating it's 15th anniversary this week!

Brie says that her time on set of the movie is what inspired her to strive to direct someday.

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