Best Dressed of the Week: Lupita Nyong'o Turns Heads at Marie Claire Party

Plus, looks from Willow Smith, RiRi and Rita Ora.

Lupita Nyong'o - Nyong'o is spotted at the Marie Claire Fresh Faces party this week along with her fellow cover girls. The Hollywood starlet arrives in a gorgeous Giambattista Valli Fall 2013 Couture dress with a flare skirt and blue floral embroidery.  (Photo: Valerie Macon/Getty Images)

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Lupita Nyong'o - Nyong'o is spotted at the Marie Claire Fresh Faces party this week along with her fellow cover girls. The Hollywood starlet arrives in a gorgeous Giambattista Valli Fall 2013 Couture dress with a flare skirt and blue floral embroidery. (Photo: Valerie Macon/Getty Images)

Photo By Photo: Valerie Macon/Getty Images

All Grown Up - Willow Smith, looking way beyond her 13 years, strikes a pose inside Christian Combs's 16th birthday party at 1OAK nightclub in West Hollywood, California. (Photo: Chelsea Lauren/Getty Images)

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Willow Smith - Jaden’s little sister is looking way older than 13 years old at Christian Casey Combs' 16th birthday party at 1OAK. The singer-actress poses in a vibrant blue pantsuit with two-toned dreads and some fierce makeup. (Photo: Chelsea Lauren/Getty Images)

Photo By Photo: Chelsea Lauren/Getty Images

Rihanna  - We are starting to think many of our favorite stylistas are on the same team, having all jumped on this season’s sporty-meets-chic trend. Be it athletic jerseys paired with jeans or cute frocks teamed with Air Jordans, Rihanna, Zendaya and more show us how it’s done. By Britt Middleton  Rih is the queen of mixing feminine and masculine styles, and it’s never been more apparent in her straight-off-the-runway ribbed Celine dress (unzipped down-to-there for extra oomph!) and Nike trainers combo.  (Photo: Noel Vasquez/GC Images)

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Rihanna - RiRi does it up even when she's chilling courtside at a basketball game. The singer attends the Los Angeles Clippers vs. Oklahoma City Thunder game in L.A. wearing a chic navy dress with red and yellow stripes from Céline's Spring 2014 collection. She fittingly completes the look with a pair of Nike Air Max. (Photo: Noel Vasquez/GC Images)

Rita Ora - The singer's style always screams "Fun!" and "Party!" and during a visit to Key 103 in Manchester, England, Ora sports this blue-and-white gingham jumpsuit with crystal details along the collar. She pairs the outfit with a colorful pair of Sophia Webster heels.  (Photo: Jonser/Splash News)

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Rita Ora - The singer's style always screams "Fun!" and "Party!" and during a visit to Key 103 in Manchester, England, Ora sports this blue-and-white gingham jumpsuit with crystal details along the collar. She pairs the outfit with a colorful pair of Sophia Webster heels. (Photo: Jonser/Splash News)

Freida Pinto - The actress makes her way to the opening of H&M in Munich, Germany, and she picks this adorable piece from the brand's new Conscious collection. We’re loving wide-leg pants right now.   (Photo: Franco Gulotta/WENN.com)

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Freida Pinto - The actress makes her way to the opening of H&M in Munich, Germany, and she picks this adorable piece from the brand's new Conscious collection. We’re loving wide-leg pants right now. (Photo: Franco Gulotta/WENN.com)

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Alek Wek - Also at the H&M Munich store opening, the supermodel goes for a feminine look with a white lace dress featuring beaded details along the collar and beaded open-toe heels, also from the H&M Conscious collection.   (Photo: Franco Gulotta/WENN.com)

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Alek Wek - Also at the H&M Munich store opening, the supermodel goes for a feminine look with a white lace dress featuring beaded details along the collar and beaded open-toe heels, also from the H&M Conscious collection. (Photo: Franco Gulotta/WENN.com)

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Thandie Newton - The British actress hits the red carpet for the Half of a Yellow Sun London premiere looking flawless in this Osman Yousefzada sheath dress with metallic detail. (Photo: Optic Photos, PacificCoastNews)

Photo By Photo: Optic Photos

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Jamie Foxx - The actor is sharp at The Amazing Spider-Man 2: Rise of Electro world premiere in London. For the event, Foxx expertly mixes different shades of gray with a charcoal pinstripe suit, light gray dress shirt and a steel tie with matching pocket square. (Photo: Gareth Cattermole/Getty Images for Sony)