Katherine Litwack (born June 13, 1986) known professionally as Kat Dennings, is an American actress.
Bio: She made her acting debut at age 10 in an ad for potato chips. She dated actor Matthew Gray Gubler in 2007. From 2011 until 2014 she dated actor Nick Zano. She then began dating singer Josh Groban in 2014.
Wiki: Comedic actress who became known for her roles in Nick and Norah's Infinite Playlist and Thor. Her roles in 40-Year-Old Virgin and Big Momma's House brought her additional recognition. She also stars on the TV series 2 Broke Girls.