Best Dressed of the Week: Yaya DaCosta Captivates in Christian Siriano

Plus, must-see looks from Solange, Keke Palmer and others.

Yaya DaCosta - The model/actress looks like a lean, green vision in a Christian Siriano Resort 2015 cascading gown at the American Ballet Theatre's 75th Anniversary Gala. By Jazmine A. Ortiz(Photo: Dimitrios Kambouris/Getty Images)

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Yaya DaCosta - The model/actress looks like a lean, green vision in a Christian Siriano Resort 2015 cascading gown at the American Ballet Theatre's 75th Anniversary Gala. By Jazmine A. Ortiz(Photo: Dimitrios Kambouris/Getty Images)

Keke Palmer - The Brotherly Love star’s Rubin Singer suit, spotted here at the Elle Women in Music celebration, is so avant-garde. We hope she continues to make fashion leaps and bounds like this.(Photo: Frazer Harrison/Getty Images)

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Keke Palmer - The Brotherly Love star’s Rubin Singer suit, spotted here at the Elle Women in Music celebration, is so avant-garde. We hope she continues to make fashion leaps and bounds like this.(Photo: Frazer Harrison/Getty Images)

Solange Knowles - Solo’s style game is always consistent. The black-and-white color-block on this Stephane Rolland Spring 2015 couture gown is everything!(Photo: Julien M. Hekimian/Getty Images for Martell Cognac)

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Solange Knowles - Solo’s style game is always consistent. The black-and-white color-block on this Stephane Rolland Spring 2015 couture gown is everything!(Photo: Julien M. Hekimian/Getty Images for Martell Cognac)

Photo By Photo: Julien M. Hekimian/Getty Images for Martell Cognac

Beyoncé - We’ll call this bumble-Bey yellow! The Queen flosses on the streets of NYC in a Zadig & Voltaire “Ved Deluxe” blazer and “Parone Deluxe” pants from the brand.(Photo: PacificCoastNews)

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Beyoncé - We’ll call this bumble-Bey yellow! The Queen flosses on the streets of NYC in a Zadig & Voltaire “Ved Deluxe” blazer and “Parone Deluxe” pants from the brand.(Photo: PacificCoastNews)

Photo By Photo: PacificCoastNews

EJ Johnson - Magic Johnson’s son, wearing his signature all-black everything, struts around town with a brand new attitude after his major weight loss. Lookin’ fierce, EJ!(Photo: Robin Marchant/Getty Images)

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EJ Johnson - Magic Johnson’s son, wearing his signature all-black everything, struts around town with a brand new attitude after his major weight loss. Lookin’ fierce, EJ!(Photo: Robin Marchant/Getty Images)

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Chanel Iman - The supermodel stuns at the Cannes Film Festival in this Zuhair Murad Couture gown. Isn’t she lovely?(Photo: Tristan Fewings/Getty Images)

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Chanel Iman - The supermodel stuns at the Cannes Film Festival in this Zuhair Murad Couture gown. Isn’t she lovely?(Photo: Tristan Fewings/Getty Images)

Photo By Photo: Tristan Fewings/Getty Images

Kenya Moore - The Real Housewives of Atlanta star is divine in this Spring 2015 Cushnie Et Ochs marigold plunging dress. This hue is hot!(Photo: Robin Marchant/Getty Images)

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Kenya Moore - The Real Housewives of Atlanta star is divine in this Spring 2015 Cushnie Et Ochs marigold plunging dress. This hue is hot!(Photo: Robin Marchant/Getty Images)

Photo By Photo: Robin Marchant/Getty Images

Mariah Carey - The songstress arrives at Live! With Kelly and Michael, slaying in a plunging pink high-low dress. We've never seen her look better!(Photo: JP8/WENN.com)

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Mariah Carey - The songstress arrives at Live! With Kelly and Michael, slaying in a plunging pink high-low dress. We've never seen her look better!(Photo: JP8/WENN.com)

Kerry Washington - The Scandal star graces the Disney Media Distribution International Upfronts looking pretty in pleats. #Gorge(Photo: Frederick M. Brown/Getty Images)

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Kerry Washington - The Scandal star graces the Disney Media Distribution International Upfronts looking pretty in pleats. #Gorge(Photo: Frederick M. Brown/Getty Images)

Photo By Photo: Frederick M. Brown/Getty Images

Salma Hayek - Purple-licious! This low-plunge Gucci gown is an unforgettable show-stopper at the 2015 Cannes Film Festival.(Photo: Pascal Le Segretain/Getty Images)

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Salma Hayek - Purple-licious! This low-plunge Gucci gown is an unforgettable show-stopper at the 2015 Cannes Film Festival.(Photo: Pascal Le Segretain/Getty Images)

Photo By Photo: Pascal Le Segretain/Getty Images