Rihanna, Mariah Carey, Oprah and More Best & Worst Dressed (PHOTOS)

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Diane Kruger opted for florals, Amanda Seyfried glittered in Gucci, and Lily Collins flashed some midriff. See fashion’s highs and lows of the week.

Jason Kempin/Getty; Paul A. Hebert/Getty; Rob Kim/Getty

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Kerry Washington always looks fabulous—and the Television Critics Association’s Summer Press Tour was no exception. She wore a red-and-white Giambattista Valli dress with taupe Christian Louboutin pumps.

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The Game of Thrones star went straight to the Chateau Marmont after the TCA party in Los Angeles on Saturday, where she was photographed in a perfect white column dress from Jason Wu’s Resort 2014 collection, Jason Wu clutch, and Bruno Magli sandals.

David Tonnessen/PacificCoastNews

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So simple, and yet so good: Watts and Schreiber looked lovely at the New York premiere of The Butler, the new Lee Daniels film in which Schreiber portrays Lyndon B. Johnson. Watts looked especially chic in a black Thakoon jumpsuit and Givenchy heels.

Larry Busacca/Getty for The Weinstein Company

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At the Hollywood premiere of Lovelace—the film about Linda Lovelace that opens Friday—Amanda Seyfried glittered in a short Gucci frock and Givenchy sandals.

Jason Kempin/Getty

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Since she broke her arm, Mariah Carey has made something of a meme out of her bedazzled casts—showing up in an assortment of beaded bandages. The one she rocked at The Butler’s New York premiere was true to fashion: big, bold, and blingy.

Charles Sykes/Invision/AP

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Oprah made news for the 3.5-pound wig she wore on the cover of O this month—and her real-life hair on the red carpet of The Butler was almost as dramatic. The Queen of Everything wore a knee-length, sequined Theia cocktail dress and Bottega Veneta clutch.

Jamie McCarthy/Getty

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The actress looked typically delightful in a Mary Katrantzou strapless dress at the Fox All-Star Party during TCA on August 1^st in LA.

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Though she’s known now for her love of crop-tops and drop-crotches, Rihanna bared (almost) all on a trip to the Carnival celebration in Barbados over the weekend—and looked pretty insane while doing it.

Splash News

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Lady Mary didn’t do herself any favors with the washed-out short-suit she wore to the Downton Abbey Season 4 photo call in L.A. this week.

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Lily Collins’s future may be bright—but her revealing outfit missed the mark at the Seventeen magazine September cover issue party on August 6.

Rob Kim/Getty

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The So You Think You Can Dance star looked fit for the beach on top—but fit for a tiki on the bottom—at the Young Hollywood Awards in Santa Monica on August 1^st.

Alberto E. Rodriguez/Getty for PMC

Rihanna, Mariah Carey, Oprah and More Best & Worst Dressed (PHOTOS)

Diane Kruger opted for florals, Amanda Seyfried glittered in Gucci. A look at fashion’s highs and lows.

Isabel Wilkinson