Blake Lively is Pippa Lee

Gossip Girl star Blake Lively trades in her Serena van der Woodsen designer-wear for some casual beach-wear on the set of her new movie, The Private Lives of Pippa Lee on Jennings Beach in Fairfield, Connecticut on Tuesday.

In the film, Blake, 20, plays the teenage Pippa Lee while Robin Wright Penn plays the older version. After her much older husband forces a move to a suburban retirement community, Pippa Lee engages in a period of reflection and finds herself heading toward a quiet nervous breakdown. Keanu Reeves, Julianne Moore, Alan Arkin and Winona Ryder costar.