TOWIE's Chloe Sims shows off her curves in a figure-hugging backless dress at Rita Ora's party

Rita Ora puts on VERY cheeky display at singer's star-studded pre-Grammy party in LA

Kristen Stewart is rocker cool in a torn tee at singer Rita Ora's pre-Grammy party in LA

Tom Hanks and Rita Wilson exude class at the MusiCares Person of the Year gala