Katie Holmes Has 'Tropic Thunder'

Katie Holmes will exercise her comedic acting chops with a cameo appearance in the upcoming film Tropic Thunder, according to OK!

Katie, 28, will join the film’s star (and producer and director) Ben Stiller and costars Robert Downey, Jr., Jack Black and Nick Nolte.

Tropic Thunder is about a group of actors shooting a big-budget war movie and through a series of freak occurrences, they are forced to become the soldiers they are portraying. The funny flick opens in 2008.

UPDATE: It’s Tom Cruise who’ll be in Tropic Thunder, not Katie Holmes.