Watch Mark Ruffalo Discover Marvel Co-Star Brie Larson Was Also in '13 Going on 30'

Did you know Captain Marvel star Brie Larson was in 13 Going on 30, along with Mark Ruffalo? No? Well, apparently neither did Ruffalo, who was so surprised when he was shown a picture of the actress in the 2004 romantic comedy.

Granted Ruffalo and Larson didn't actually work together on the same scenes, but they did appear in the same movie, and it wasn't until Entertainment Tonight revealed it to the Hulk actor did he realize.

ET got to speak to Ruffalo on the red carpet as he was heading into for the Avengers: Endgame world premiere with his co-stars. With the 15th anniversary of 13 Going On 30 yesterday, it was the best time to bring up that both the Marvel stars had appeared in the movie.

Larson played one of the "Six Chicks" during the 1980s scenes, and Ruffalo played the older version of Matt, Jennifer Garner's love interest, so they wouldn't have had any scenes together.

“She was a mean girl! Oh my God, that’s amazing. Wow, I didn’t know that,” Ruffalo said as he was presented with a photo of Larson in the film. “We didn’t work together [on that movie].”

Both Ruffalo and Larson have come a long way since their days in the iconic romantic comedy, turning into badass superheroes.

[h/t: People]