By Leah Ornstein - Breaking Celebrity News Features Editor

Who was dressed to win and sin at the swankiest soiree in Hollywood on Tuesday night?

Celebrities flocked to the 2012 GQ Men of the Year party at the Chateau Marmont in Los Angeles, where they got all dressed up in designer duds and hit the red carpet, however, not every star sported fabulous fashion. Breaking Celebrity News has photos and details about all the best, worst and wackiest dressed stars from the annual event.

Red hot was definitely on the agenda! Rihanna kept things simply sexy in a Calvin Klein slip dress paired with Manolo Blahnik sandals and Neil Lane bling, while hot mama Jennie Garth showed off her fab figure in an exposed zipper peplum dress. Jenna Dewan Tatum (in Amanda Wakeley) and Brittany Snow also scorched up the red carpet in scarlet.

Arrow ingenue Katie Cassidy failed to flatter her figure in an awkward tomato colored number, while Krysten Ritter showed off her underwear in Dolce & Gabbana.