Sequins, cut-outs, and tulle trains are just a few of highlights on our latest Best Dressed list. The First Lady of The United States attended her last State Dinner in Washington D.C. in one knockout of a dress. Mrs. Obama turned heads in a custom made Atelier Versace gown while hosting the Prime Minister of Italy. The shimmering rose-gold fabric showed off her enviable arms, and is easily one of our all-time favorite looks from her. Rachel McAdams made a grand entrance at the L.A. premiere of her newest film 'Doctor Strange'. The blonde beauty also wore a custom Versace number. The color combination and the cascading ruffle-to-bow transition made this gown one regal look. Katy Perry was the belle of the ball at the Once Upon A Time Gala. Walking the red carpet in a stunning floral embroidered Marchesa gown, complete with a delicate nude train. On a darker, sexier note Amy Adams worked her magic in a Tom Ford design at the London premiere of 'Nocturnal Animals'. It's only fitting the star of the film should wear her director, as Mr. Ford is crossing over to film once again. Kristen Stewart is always one to take risks, and she just might have met her perfect match. The César winner got edgy-chic in a Rodarte blouse and pants combo, complete with ruffles, safety pins, and lace. With so much going on, not just anyone could have pulled this off. But Miss.Stewart makes it looks effortless, as well as pretty bad-ass. To see all of this memorable looks, plus many more check out our full gallery above.