Last Night's Look: Hit or Miss?

Vote on this week's styles including Ashlee Simpson, Mariah Carey and more stars! You decide – are they fashionistas or flops?

HEIDI MONTAG

The Hills star trades in her bridal trousseau for an off-the-shoulder black ruffled dress, cinched at the waist with a corseted buckle belt, and matching platform heels for the T-Mobile party in L.A.