Going on 30 fans, we bet you didn't expect to see this reunion happening! On March 31, Jennifer Garner (who portrayed Jenna ...

As a result, they took to the comments to ask where Mark Ruffalo (who played Matty Flamhaff in 13 Going on 30) was for this reunion. "Where is Matty?! 😍😍😍," one person begged in the comments, ...