Last Night's Look: Hit or Miss?

Vote on this week's styles including Rachel McAdams, Kim Kardashian and more stars! You decide – are they fashionistas or flops?

BRITNEY SPEARS

Before being honored with the ultimate choice award for her contributions to the entertainment industry, the Circus star heats up the Teen Choice red carpet in an asymmetrical, shimmering black Roberto Cavalli minidress and straight platinum locks.