Best Dressed of the Week: Gugu Mbatha-Raw Goes Bold in Blue

Plus, must-see looks from Khloe Kardashian and others.

Gugu Mbatha-Raw - The starlet looks blue-tiful at the premiere of Relativity Studios and BET Networks' Beyond the Lights in Hollywood. The lace side panels on her cobalt dress add some sass to this classy frock. By Jazmine A. Ortiz (Photo: David Buchan/Getty Images)

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Gugu Mbatha-Raw - The starlet looks blue-tiful at the premiere of Relativity Studios and BET Networks' Beyond the Lights in Hollywood. The lace side panels on her cobalt dress add some sass to this classy frock. By Jazmine A. Ortiz (Photo: David Buchan/Getty Images)

Photo By Photo: David Buchan/Getty Images

Rihanna - Talk about presidential style! RiRi hits the White House wearing a colorfully printed Stella Jean dress and Manolo Blahnik “Chaos” sandals. (Photo: Gene Young/Splash News)

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Rihanna - Talk about presidential style! RiRi hits the White House wearing a colorfully printed Stella Jean dress and Manolo Blahnik “Chaos” sandals. (Photo: Gene Young/Splash News)

High-Fashion Pro: Nicole Richie - She doesn't just love fashion, she lives it. With her House of Harlowe 1960 line, and her ability to launch trends (pastel-colored hair, anyone?), Nicole Richie shows at every turn that she is a true style star.   (Photo: Frederick M. Brown/Getty Images)

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Nicole Richie - White has never look so devilishly good! Here, the Candidly Nicole star dons a white Tadashi Shoji cape, H&M dress, and Christian Louboutin pumps to the 2014 Baby2Baby Gala. (Photo: Frederick M. Brown/Getty Images)

Kerry Washington - Also at the Baby2Baby Gala, the Scandal star ditches her Olivia Pope duds for this jacquard Oscar de la Renta fit-and-flare dress. The actress is a fan of the late designer's style, and we agree: she's definitely Oscar-worthy! (Photo: Frederick M. Brown/Getty Images)

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Kerry Washington - Also at the Baby2Baby Gala, the Scandal star ditches her Olivia Pope duds for this jacquard Oscar de la Renta fit-and-flare dress. The actress is a fan of the late designer's style, and we agree: she's definitely Oscar-worthy! (Photo: Frederick M. Brown/Getty Images)

Zendaya - What's black, white and fierce all over? Zendaya! She’s in a Christian Siriano Fall 2014 gown at the Academy of Motion Picture Arts and Sciences 2014 Governors Awards in Hollywood. (Photo: Frazer Harrison/Getty Images)

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Zendaya - What's black, white and fierce all over? Zendaya! She’s in a Christian Siriano Fall 2014 gown at the Academy of Motion Picture Arts and Sciences 2014 Governors Awards in Hollywood. (Photo: Frazer Harrison/Getty Images)

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Lupita Nyong'o - The actress proves once again she can wear it all (even shorts!) on the red carpet. For the 2014 Glamour Women of the Year Awards, she sports a gold-embellished creation from Chanel’s Fall 2014 couture collection. (Photo: Dimitrios Kambouris/Getty Images for Glamour)

"The Night Is Still Young" - Nicki Minaj gives the ladies something to turn up to with this smash that's sure to rock the clubs and the pop charts. The feel good track about enjoying life finds the Pinkprint MC getting the party started with lines like, "Yo, ayo tonight is the night that I'ma get twisted / Myx Moscato and vodka, I'ma mix it / Roll that spaceship, we about to get lifted."(Photo: Ian Gavan/MTV 2014/Getty Images for MTV)

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Nicki Minaj - The 2014 MTV EMAs host is dressed to impress in a silky sequin Saint Laurent mini dress. This glitzy number was our favorite of the night! (Photo: Ian Gavan/MTV 2014/Getty Images for MTV)

Freida Pinto - The actress wows at the Glamour Women of the Year Awards in a slinky Jason Wu Spring 2015 dress that hits all the right stops: décolletage, sexy side cut-out and a thigh-grazing split. (Photo: Dimitrios Kambouris/Getty Images for Glamour)

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Freida Pinto - The actress wows at the Glamour Women of the Year Awards in a slinky Jason Wu Spring 2015 dress that hits all the right stops: décolletage, sexy side cut-out and a thigh-grazing split. (Photo: Dimitrios Kambouris/Getty Images for Glamour)

Laverne Cox - The Orange Is the New Black star reaches a major high at the Glamour Women of the Year Awards in this curve-hugging, royal blue evening gown. (Photo: Dimitrios Kambouris/Getty Images for Glamour)

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Laverne Cox - The Orange Is the New Black star reaches a major high at the Glamour Women of the Year Awards in this curve-hugging, royal blue evening gown. (Photo: Dimitrios Kambouris/Getty Images for Glamour)

Khloé Kardashian - KoKo's navy frock at boo French Montana's birthday bash is the talk of the town this week. While we’d typically err on the side of caution when it comes to twin thigh-high slits and a super sheer fabric, she easily turns this "fashion don't" around. Hot! (Photo: FayesVision/WENN.com)

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Khloé Kardashian - KoKo's navy frock at boo French Montana's birthday bash is the talk of the town this week. While we’d typically err on the side of caution when it comes to twin thigh-high slits and a super sheer fabric, she easily turns this "fashion don't" around. Hot! (Photo: FayesVision/WENN.com)