08:02 PM EDT 08/23/2014
Originally posted 06/27/2014 10:20AM
An innocent viewer question led to a big revelation on Thursday's episode of Watch What Happens Live.
Mark Ruffalo stopped by the show with Keira Knightley to promote their new movie Begin Again, but it was a different female costar that fans were curious about.
The 46-year-old actor was asked by a viewer if he still kept in touch with 13 Going on 30 pal Jennifer Garner, and Ruffalo had a surprising answer.
Originally posted 04/20/2004 3:17PM
At 13, Mark Ruffalo was too busy skateboarding to even think about the big screen. Now what would've seemed like a pipe dream is the 36-year-old's life: He's a movie star, acting alongside Jennifer Garner in 13 Going on 30 and even sharing the screen with Robert Redford (The Last Castle) and Jim Carrey (Eternal Sunshine of the Spotless Mind). But while Garner gets to skip the long trip to success in their new movie, Ruffalo, whose big break came in 2000's You Can Count On Me, had to endure all the growing pains, including overcoming a brain tumor.
Top 10 News Categories
The most buzzed about stars this minute!
Treat Yourself! 4 Preview Issues
More On PEOPLE.com
Got a News Tip?
Send it to our People.com editors!