Best Dressed of the Week: Alicia Keys's Hot Mama Maternity Style

Plus, must-see looks from Rihanna and others.

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Alicia Keys - The singer gets an A+ for her flawless maternity style at the 9th Annual Keep A Child Alive Black Ball in NYC. She beams in a black Givenchy stunner with silver straps. By Jazmine A. Ortiz (Photo: D Dipasupil/Getty Images)

Photo By Photo: D Dipasupil/Getty Images

Rihanna Is Back on the 'Gram - Ladies and gentlemen, Rihanna is back on Instagram! Prepare for her usual mix of travel photos, naked photos, high fashion photos and other ratchet moments of her life captured forever. You get a #thirsttrap and you get a #thirsttrap and you get a #thirsttrap! Everyone gets a #thirsttrap!  (Photo: Jason Merritt/Getty Images for amfAR)

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Rihanna - Only Rih! Whether she was trying to bring attention to the fight against AIDS at the 2014 amfAR LA Inspiration Gala or just attention to her amazing body, mission accomplished. The gala honored Tom Ford, so the singer sports one of his risqué designs to the event in Hollywood. (Photo: Jason Merritt/Getty Images for amfAR)

Rocsi Diaz - The TV personality makes a bold statement in her glittery Michael Costello gown at the amfAR LA Inspiration Gala. Lookin' good, girl. (Photo: Jonathan Leibson/Getty Images for FIJI)

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Rocsi Diaz - The TV personality makes a bold statement in her glittery Michael Costello gown at the amfAR LA Inspiration Gala. Lookin' good, girl. (Photo: Jonathan Leibson/Getty Images for FIJI)

Jenny the Jewel - Jennifer Lopez, arrives onset of American Idol with her castmates, Keith Urban, Harry Connick, Jr. and Ryan Seacrest wearing a fly emerald green pantsuit in Los Angeles.(Photo: Miguel Aguilar, PacificCoastNews)

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Jennifer Lopez - J.Lo arrives on the set of American Idol in LA in a gorgeous green monochromatic ensemble by ICB. (Photo: Miguel Aguilar, PacificCoastNews)

Zendaya Coleman - Starting out on Disney’s Shake It Up, Zendaya has parlayed her success into successful ad campaigns for Madonna’s Material Girl fashion line. But she’s more than a pretty face: the 18-year-old is currently developing her next Disney TV show, K.C. Undercover, for which she’s also an executive producer.   (Photo: Fortunata / Splash News)

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Zendaya - Sophisticated, classy and chic — Z nails this menswear-inspired look for an appearance on Good Day New York. (Photo: Fortunata / Splash News)

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Mel B - The X Factor judge brings the spice to opening night of Memphis in London wearing a Julien Macdonald Fall 2014 strapless embellished frock.  (Photo: WENN.com)

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Mel B - The X Factor judge brings the spice to opening night of Memphis in London wearing a Julien Macdonald Fall 2014 strapless embellished frock.  (Photo: WENN.com)

Naya Rivera - The actress poses in a sexy signature wrap dress by DKNY at the Brian Bowen Smith show in West Hollywood, California.   (Photo: Jason Merritt/Getty Images for De Re Gallery)

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Naya Rivera - The actress poses in a sexy signature wrap dress by DKNY at the Brian Bowen Smith show in West Hollywood, California.  (Photo: Jason Merritt/Getty Images for De Re Gallery)

Kim Kardashian - Mrs. West arrives at TAO Nightclub in Vegas to kick off her birthday festivities and chooses to show off her famous figure in a flawless white look. (Photo: David Becker/Getty Images)

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Kim Kardashian - Mrs. West arrives at TAO Nightclub in Vegas to kick off her birthday festivities and chooses to show off her famous figure in a flawless white look. (Photo: David Becker/Getty Images)

Camila Alves McConaughey - Talk about stellar style! Mrs. Matthew McConaughey gleams on the red carpet (or in this case the black carpet) at the premiere of Interstellar in Hollywood, California.   (Photo: Frazer Harrison/Getty Images)

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Camila Alves McConaughey - Talk about stellar style! Mrs. Matthew McConaughey gleams on the red carpet (or in this case the black carpet) at the premiere of Interstellar in Hollywood, California.  (Photo: Frazer Harrison/Getty Images)

Alek Wek - The supermodel shimmers in a figure-skimming lamé dress and ankle-strap sandals at the InTouch Awards 2014 in Germany.  (Photo: Mathis Wienand/Getty Images for InTouch)

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Alek Wek - The supermodel shimmers in a figure-skimming lamé dress and ankle-strap sandals at the InTouch Awards 2014 in Germany. (Photo: Mathis Wienand/Getty Images for InTouch)