How often does this happen? Will Smith was on Letterman last night and noted that his 7-year-old daughter Willow’s film Kit Kittredge: An American Girl opens wide against his Hancock in U.S. theaters on the same day (July 2nd). Said Will, “I told her, ‘Daddy loves you sweetie, but I gots to stomp you at the box office.’ ” Then Dave snarked, “I’ve got a son, but even I know that American Girl thing is very popular.” But Willow was quoted as saying a few days earlier about her Dad, “He thinks he is going to be beat me, but I think not. I think I am going to beat him.”