Mark Ruffalo Had No Idea Brie Larson Was in 13 Going on 30 — Watch His Hilarious Reaction

Mark Ruffalo is stunned to find out Brie Larson had a role in his 2004 hit film 13 Going On 30

Mark Ruffalo Had No Idea Brie Larson Was in 13 Going on 30

Mark Ruffalo Finding Out That Brie Larson Was In 13 Going On 30 Is Absolutely Amazing

Mark Ruffalo Doesn't Recall Brie Larson Being in '13 Going on 30

Mark Ruffalo Had No Idea Brie Larson Was in '13 Going on 30

13 Going on 30 Star Mark Ruffalo Didn't Know Brie Larson Was Also in It

Mark Ruffalo Doesn't Recall Brie Larson Being in '13 Going on 30

Mark Ruffalo Had The Cutest Reaction To Learning Brie Larson Was In '13 Going On 30

Watch Mark Ruffalo's Amazed Response to Learning Brie Larson Was in '13 Going on 30

Mark Ruffalo Had No Idea Brie Larson Was in '13 Going on 30