Katie Holmes slipped on some baggy sweats for a trip to the dance studio in LA yesterday. She's back on the West Coast after filming Son of No One in New York where Suri joined her on set and showed off her own ballet attire. The little one, who turned four over the weekend with a cupcake tea party, is growing up so fast that even animated characters don't fool her. Tom Cruise's Knight and Day costar Cameron Diaz recently talked about how Suri knows that she's the voice behind the Princess Fiona character in Shrek saying of Suri's love for the series, "I’m not going to speak for her, but yes, I think she does [love it]."