Our PicksBest & Worst Dressed of the WeekLori-Lee Emshey08.30.13Our PicksBest & Worst Dressed of the WeekMichelle Obama looked classic in black and red Tracy Reese, Kate Moss glowed in yellow Louis Vuitton, and Rihanna actually wore clothes. See fashion's highs and lows this week.Lori-Lee Emshey08.30.13 8:45 AM ETJun Sato/WireImage; Alex Wong/Getty; Michael Stewart/WireImage; Ian Gavan/GettyMichelle Obama looked classic in black and red Tracy Reese, Kate Moss glowed in yellow Louis Vuitton, and Rihanna actually wore clothes. See fashion's highs and lows this week. Josiah Kamau/BuzzFoto/FilmMagicBest Dressed, Summer Florals: Alexa ChungAlexa Chung rocked a feminine floral and black Kenzo peplum dress while leaving her NYC hotel. She accessorized with terracotta sandals, a black shoulder bag, and an Orla Kiely iPhone case. Michael Stewart/WireImageBest Dressed, Bow Down: BeyoncéDespite her absence from the VMAs, Beyoncé showed up to the awards' after-party at the PH-D rooftop lounge in New York wearing a curve-hugging, black Tom Ford dress with sheer detailing. Bey opted for gold-embroided Brian Atwood ankle-strap pumps, a custom crystal and diamond ring, and a gold Giuseppe Zanotti clutch. Kay-Paris Fernandes/GettyBest Dressed, Mixing Patterns: Léa SeydouxFrench beauty Léa Seydoux kept things casual but classy at the Paris premiere of Grand Central. Seydoux opted for an off-the-runway Louis Vuitton Resort 2014 navy and white striped, long-sleeved dress under a frayed, shorter-sleeved coat. Alex Wong/GettyBest Dressed, Screaming Sophistication: Michelle ObamaMichelle Obama wore a simple shift from Tracy Reese's fall 2013 collection while celebrating the 50th anniversary of Martin Luther King’s March on Washington. The red poppies—a symbol of remembrance—popped against the black flared dress. Ian Gavan/GettyBest Dressed, Red Hot: Sandra BullockSandra Bullock opened the 70th Venice Film Festival in an asymmetrical J. Mendel Resort 2014 gown. She accented the fiery frock with Martin Katz jewels, a black Roger Vivier tube clutch, and ankle-strap sandals. Jun Sato/WireImageBest Dressed, The Ultimate Muse: Kate MossKate Moss glowed in an asymmetrical, butter-yellow Louis Vuitton Resort 2014 dress with bell sleeves and a rhinestone-studded neckline. Moss was attending Louis Vuitton's “Timeless Muses” exhibition, in which she is featured, in Tokyo. AKM Images/GSI MediaBest Dressed, So Unlike Herself: RihannaRihanna took a break from promoting her River Island collection (and apparently from her wild and crazy wardrobe) and stepped out in light pink Givenchy blazer paired over a structred white blouse, skinny J Brand jeans, and black Manolo Blahnik sandals. Brad Barket/Getty for Moet & ChandonWorst Dressed, Out of Place: Johnny WeirIf Lady Gaga's VMA outfit got in a fight with a Victoria’s Secret angel, Johnny Weir's outfit would be the result. The figure skater looks, well, a bit out of place at the U.S. Open in white booty shorts, a white leather vest, and angel wings while celebrating Moët & Chandon’s 270th anniversary. FameFlynetWorst Dressed, Girl Gone Grunge: Lana Del ReyLana Del Rey left the Courtney Love concert in lace leggings, a plaid shirt, and a graphic tee this week. Throw some false lashes on top of it all and her way-too-’90s outfit is a perfect storm of wrong.