Katherine Litwack, known professionally as Kat Dennings, is an American actress from Bryn Mawr, Pennsylvania.
Kat is of Jewish heritage.
Dennings began her career in commercials at the age of 10. After doing commercials for a few years, she began work in television, starting with a role on HBO's Sex and the City (1998), following up with roles on Raising Dad (2001), The Scream Team (2002), Everwood (2002), Without a Trace (2002) and ER (1994), among others.
Kat made the move to the big screen with supporting roles in Raise Your Voice (2004), The 40-Year-Old Virgin (2005) and Big Momma's House 2 (2006). She later achieved a level of fame with roles in The House Bunny (2008) and Nick and Norah's Infinite Playlist (2008).