Sexy Stars At Pippa Lee Premiere

At the New York premiere of The Private Lives of Pippa Lee, Blake Lively stunned the crowd by wearing a dramatically low cut Marchesa jacket with super short shorts.  The actress was joined by her beau, Penn Badgley, who was dressed significantly more conservative than his main Gossip Girl.

While Blake showed a lot skin, another A-list actress was swimming in her designer frock.  Who was it and what was she wearing?  Check out the gallery in Style to find out!