Harper's Bazaar drew out a fashion-centric celebrity crowd with last night's celebration of Decades' new Bravo series, Dukes of Melrose, with arrivals including this trio of trendsetters: Cat Deeley, Ashley Madekwe, and Sophia Bush. Cat bared her midriff in a navy-and-red striped crop top and pleated skirt set from Michael Kors Spring '13, but kept the rest simple with understated pumps and just a punched-up red lip. Ashley adhered to a more traditional party-dress dress code in a Three Floor LBD (which you can purchase!) with a flirty flared skirt and a pair of ankle-strap evening sandals to finish it off. Meanwhile, Sophia hit the red carpet in a one-shouldered vintage Halston number that played perfectly into the night's celebration of the famed vintage boutique Decades. Now it's up to you to pick your best-dressed winner from the night's event — which look is your favorite?