Jack Nicholson attends the "How Do You Know" premiere in Los Angeles

Actor Jack Nicholson (R), a cast member in the motion picture romantic comedy "How Do You Know", is greeted by his daughter Jennifer Nicholson and her sons Duke (L) and Sean (3rd-L) as he arrive for the premiere of the film at the Mann Village Theatre in the Westwood section of Los Angeles on December 13, 2010. UPI/Jim Ruymen