Irina Shayk in Replay 

Bar Rafaeli in Replay 

Lady Gaga in Paco Rabbane

Selena Gomez in Marches & Casadei shoes 

As for the worst dressed I had to list Katy Perry dressed head-to-toe in Jeremy Scott Spring 2012 collection. She looks horrible and her makeup looks gross! I really wish she would stop trying so hard.