Our PicksBest & Worst Dressed of the WeekThe Fashion Beast Team12.20.13Our PicksBest & Worst Dressed of the WeekMichelle Obama dons winter whites to celebrate Christmas, Julia Roberts perfects menswear, and Juliette Lewis takes the tacky prom look too far. Plus, more best and worst dressed.The Fashion Beast Team12.20.13 10:45 AM ETLandov, AP, BFAnyc.com, Splash Michelle Obama dons winter whites to celebrate Christmas in Washington, Julia Roberts perfects the menswear trend, and Juliette Lewis takes the tacky prom look too far. Plus, more best and worst dressed of the week. Pool photo by Martin H. SimonBest Dressed, Winter Whites: Michelle ObamaAlthough a repeat ensemble, Michelle Obama looked chic as ever in a white J. Mendel top with silver embroidery, a white pleated, knee-length skirt, and silver Manolo Blahnik heels at TNT's Christmas in Washington special on December 15. Dan Steinberg/Invision, via APBest Dressed, Menswear: Julia RobertsJulia Roberts seriously conquered the menswear trend, sporting a white button-down, black skirt, a sleek black blazer, and cut-out sandals, all by Givenchy, to the premiere of August: Osage County on December 16. Billy Farrell/BFAnyc.comBest Dressed, Black and Gold: Freida PintoActress Freida Pinto attended ASMALLWORLD's Holiday Weekend on December 15 in a black and gold Anamika Khanna Couture sari gown paired with a Gucci dragonfly belt and an Aquamarine cuff. Splash NewsBest Dressed, In a Mini: Rosie Huntington-WhiteleyIn a black and white minidress with a plunging neckline by Balmain, model Rosie Huntington-Whiteley attended the AEM Association Children of the World for Rwanda Charity Dinner on December 17. Dimitrios Kambouris/GettyYou Decide, Tuxedo Dressing: Kim BasingerKim Basinger arrived at the screening of Grudge Match on December 16 in a full-on pin-striped suit—tie, pocket chain, and all. Did Kim make the men's look sleek with her slicked back pony and bright red lip? Or did it look like she's been shopping in the wrong department? Kevin Winter/GettyWorst Dressed, Prom Gone Wrong: Juliette LewisYou're about 25 years too late to the party, Juliette. The actress arrived at the premiere of August: Osage County on December 16 wearing a strapless, lavender organza gown by Monique Lhullier, black Brian Atwood heels, and a crown. The prom look just isn't cutting it. Rob Kim/GettyWorst Dressed, Clashing Colors: Kristen WiigKristen Wiig's dress to the Anchorman 2: The Legend Continues premiere on December 15 looked like a mismatch of fabrics. Between the lavender, salmon, and embellishments, this dress was just a bit too risky to pull off.