Best Dressed of the Week: Serena Williams Works a Mean Dress

Plus Cassie's birthday suit and more looks we love.

Serena Williams - Sexy, skintight, black leather and strappy heels shows off Williams' athletic physique and was the tennis pro's choice for her interview on the Late Show With David Letterman. (Photo: Donna Ward/Getty Images)

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Serena Williams - Sexy, skintight, black leather and strappy heels shows off Williams' athletic physique and was the tennis pro's choice for her interview on the Late Show With David Letterman. (Photo: Donna Ward/Getty Images)

Kelly Rowland - The singer looks super chic in a form-fitting jersey dress and black leather jacket while on her dinner date at Cecconi's in West Hollywood. Love the fanny pack! (Photo: wowcelebritytv/ Splash News)

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Kelly Rowland - The singer looks super chic in a form-fitting jersey dress and black leather jacket while on her dinner date at Cecconi's in West Hollywood. Love the fanny pack! (Photo: wowcelebritytv/ Splash News)

Photo By Photo: wowcelebritytv/ Splash News

Sheer Bliss - Ciara says cheese for the paparazzi in this taupe sheer dress and nude pumps as she's spotted leaving NBC TV studios following an appearance on New York Live. (Photo: Fortunata/Splash News)

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Ciara - The "Goodies" hit maker goes for a classy look for her New York Live appearance in this delicate beaded cream dress. (Photo: Fortunata / Splash News)

Photo By Photo: Fortunata / Splash News

Cassie - Cassie dresses in all white and shows lots of leg for her birthday party at NYC's WIP. It's effortless chic-ness at its best. (Photo: Jerritt Clark/Getty Images)

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Cassie - Cassie dresses in all white and shows lots of leg for her birthday party at NYC's WIP. It's effortless chic-ness at its best. (Photo: Jerritt Clark/Getty Images)

Photo By Photo: Jerritt Clark/Getty Images

Selita Ebanks - The model makes a fierce statement in this bold printed pantsuit at Bebe's Fall 2013 campaign celebration in New York City. She selects an on-trend orange lip, statement clutch and killer booties to complete the look. (Photo:  Brad Barket/Getty Images for bebe)

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Selita Ebanks - The model makes a fierce statement in this bold printed pantsuit at Bebe's Fall 2013 campaign celebration in New York City. She selects an on-trend orange lip, statement clutch and killer booties to complete the look. (Photo:  Brad Barket/Getty Images for bebe)

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Grunge - When Zoe Kravitz does casual it's usally all about downtown style. Check her out grabbing a healthy green juice while out in the Nolita neighborhood in NYC.(Photo: Wylde/Splash News)

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Zoe Kravitz - Even Kravtiz' everyday wear looks super stylish. Here she strolls around NYC's Nolita neighborhood in short shorts, a light and breezy top, and comfy but cool flats. (Photo: Wylde / Splash News)

Emeli Sande - The singer attends Moet & Chandon's Roger Federer celebration in this eye-popping red-and-black printed dress with patent leather heeled booties. (Photo:  Bryan Bedder/Getty Images for Moet & Chandon)

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Emeli Sande - The singer attends Moet & Chandon's Roger Federer celebration in this eye-popping red-and-black printed dress with patent leather heeled booties. (Photo:  Bryan Bedder/Getty Images for Moet & Chandon)

Photo By Photo:  Bryan Bedder/Getty Images for Moet & Chandon

Leigh-Anne Pinnock - Leigh-Anne Pinnock attends the One Direction This Is Us premiere in London wearing a beautiful black pantsuit with a peplum style top. She finishes her ensemble with sleek hair, red lips and a gold chain link necklace. (Photo:  Ian Gavan/Getty Images for Sony Pictures)

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Leigh-Anne Pinnock - Leigh-Anne Pinnock attends the One Direction This Is Us premiere in London wearing a beautiful black pantsuit with a peplum style top. She finishes her ensemble with sleek hair, red lips and a gold chain link necklace. (Photo:  Ian Gavan/Getty Images for Sony Pictures)

Adrienne Bailon - Adrienne Bailon flaunts her figure (and some cleavage) in this black ruffled dress which she's accessorized with glitzy jewels and golden strap-y heels. (Photo: Jerritt Clark/Getty Images)

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Adrienne Bailon - Adrienne Bailon flaunts her figure (and some cleavage) in this black ruffled dress which she's accessorized with glitzy jewels and golden strap-y heels. (Photo: Jerritt Clark/Getty Images)

Photo By Photo: Jerritt Clark/Getty Images

Smart Lady - In high school, Keshia's favorite subject was math and she was focused, so focused that she was the valedictorian of her class. (Photo: Bennett Raglin/BET/Getty Images for BET)

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Keisha Chante - The 106 & Park co-host channels her inner rocker chick with a Marilyn Monroe vintage tank, black pants and hot pink wedge sneakers. Cute! (Photo by Bennett Raglin/BET/Getty Images for BET)