Name at birth: Jonah Hill Feldstein

Jonah Hill is the round and frizzy-haired star of the 2007 comedy Superbad. Hill got his start in show business with an assist from Dustin Hoffman, who got him an audition for I Heart Huckabees (2004). That led to a small part in the Judd Apatow comedy 40 Year Old Virgin (2006, starring Steve Carell). As part of an Apatow-led clan that includes Seth Rogen, Paul Rudd and Jason Segel, Hill has appeared in Knocked Up (2007, starring Katherine Heigl), Superbad (co-starringMichael Cera and Forgetting Sarah Marshall (2008, starring Kristen Bell). Hill's other comedies include Evan Almighty (2007), Strange Wilderness (2008), the 2008 version of Dr. Seuss's Horton Hears a Who! (starring Jim Carrey), Cyrus (2010, with Marisa Tomei) and Get Him to the Greek (2010, co-starring Russell Brand). He also co-created and lent his voice to the 2011 animated series Allen Gregory, and co-starred with Brad Pitt in the Oscar-nominated movie Moneyball (2011).