Jack Black & His Coldwater Kids

Actor Jack Black and his wife Tanya Haden spent the afternoon at the playground at Coldwater Park in Beverly Hills, California with their sons Samuel, 4, and Thomas, 2 (November 28). The hands-on dad got in on the fun, taking a turn on the swings and slide with the boys.

The High Fidelity actor is one of several stars who have signed on to a new Muppets flick that's scheduled for release in 2011.

Hangover star Zach Galifianakis, Jason Segal and new mom Amy Adams will all be joining Kermit the Frog and friends in the latest installment of the beloved Jim Henson franchise.