09/24/2010 04:45 pm ET | Updated May 25, 2011

Katherine Schwarzenegger, 20, Signs Her New Book (PHOTOS)

Katherine Schwarzenegger, the oldest daughter of Arnold and Maria Shriver, signed copies of her new body image book 'Rock What You've Got' on Thursday in California.

Katherine, 20, is a junior at the USC Annenberg School for Communication & Journalism.