Who: Cameron Diaz

Wearing: Vionnet

Where: “Knight and Day” premiere

Who: Annalynne McCord

Wearing: Rock & Republic Lucca Dress

Where: CBS Summer Press Tour Party

Who: Leighton Meester

Wearing: Erdem halter top and $25.50 skirt from the I *heart* Ronson line by JCPenny

Where: Filming on the set of Gossip Girl

Who: Kristen Bell

Wearing: George Chakra

Where: VH1 Do Something Awards