Best Dressed of the Week: Beyoncé Beams in Sassy Two-Piece

Plus, must-see looks from Kat Graham and others.

Beyoncé  - Yoncé gets cheeky on Instagram in Topshop’s Lagoon-print top and matching trousers, then sealing the deal with sexy white sandals. By Jazmine A. Ortiz  (Photo: Beyonce via Instagram)

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Beyoncé - Yoncé gets cheeky on Instagram in Topshop’s Lagoon-print top and matching trousers, then sealing the deal with sexy white sandals. By Jazmine A. Ortiz (Photo: Beyonce via Instagram)

Jessica Alba - The Sin City: A Dame to Kill For star puts this eclectic mix on the map at this year's Comic-Con International in San Diego. The actress combines a bandeau top from Tanya Taylor, a patterned skirt from Zimmermann and some hot heels.  (Photo: Frazer Harrison/Getty Images)

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Jessica Alba - The Sin City: A Dame to Kill For star puts this eclectic mix on the map at this year's Comic-Con International in San Diego. The actress combines a bandeau top from Tanya Taylor, a patterned skirt from Zimmermann and some hot heels. (Photo: Frazer Harrison/Getty Images)

Over the Shoulder - She has a sewing kit and enjoys making shoulder pieces for herself. (Photo: Ethan Miller/Getty Images)

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Kat Graham - Two-pieces are it right now! Kat kills in a long-sleeved Bec & Bridge set at Entertainment Weekly's annual Comic-Con celebration. She shows some skin while still keeping it classy. (Photo: Ethan Miller/Getty Images)

Photo By Photo: Ethan Miller/Getty Images

Glam Mode - Kim Kardashian shows off her legs in this floor-length wrap dress as she leaves a studio in Los Angeles. (Photo: Splash News)

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Kim Kardashian - Mrs. West steps out of a studio in Los Angeles wearing a Michael Costello stunner. The gold wrap dress cinches waist and shows off her assets in all the right places.(Photo: Splash News)

Ashley Madekwe  - The fashion blogger struts her stuff in a Christian Dior strapless dress with metallic patterned skirt on the red carpet at Entertainment Weekly's annual Comic-Con celebration. Her black clutch and Christian Dior two-tone sandals round out her polished look.  (Photo: Ethan Miller/Getty Images)

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Ashley Madekwe - The fashion blogger struts her stuff in a Christian Dior strapless dress with metallic patterned skirt on the red carpet at Entertainment Weekly's annual Comic-Con celebration. Her black clutch and Christian Dior two-tone sandals round out her polished look. (Photo: Ethan Miller/Getty Images)

Photo By Photo: Ethan Miller/Getty Images

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Chrissy Teigen - The Sports Illustrated swimsuit model looks sheerly amazing celebrating her cover for DuJour Magazine in NYC. Chrissy rocks a barely-there bra under a lace button-up paired with a black midi skirt.  (Photo: Craig Barritt/Getty Images for DuJour)

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Chrissy Teigen - The Sports Illustrated swimsuit model looks sheerly amazing celebrating her cover for DuJour Magazine in NYC. Chrissy rocks a barely-there bra under a lace button-up paired with a black midi skirt. (Photo: Craig Barritt/Getty Images for DuJour)

Photo By Photo: Craig Barritt/Getty Images for DuJour

Zoe Saldana - The actress's maternity style has been on fire lately, and her look for a special screening of her new film, Guardians of the Galaxy, in NYC, wasn't any different. She glows in a black Lavin dress.  (Photo: Dimitrios Kambouris/Getty Images)

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Zoe Saldana - The actress's maternity style has been on fire lately, and her look for a special screening of her new film, Guardians of the Galaxy, in NYC, wasn't any different. She glows in a black Lavin dress. (Photo: Dimitrios Kambouris/Getty Images)

Selena Gomez - The actress attends the Hollywood premiere of her flick Behaving Badly in a pair of black, high-waisted, skinny jeans and a sexy snake-skin halter top by Zimmermann.   (Photo: Frederick M. Brown/Getty Images)

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Selena Gomez - The actress attends the Hollywood premiere of her flick Behaving Badly in a pair of black, high-waisted, skinny jeans and a sexy snake-skin halter top by Zimmermann. (Photo: Frederick M. Brown/Getty Images)

Angela Simmons - Angie's summer frock is all business in the front and a party from the back! At her uncle’s 15th Annual Art for Life benefit, she dons a heavenly Balenciaga halter dress and Saint Laurent silver pumps.  (Photos from left: Brian Ach/Getty Images for Art For Life Gala, Angela Simmons via Instagram)

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Angela Simmons - Angie's summer frock is all business in the front and a party from the back! At her uncle’s 15th Annual Art for Life benefit, she dons a heavenly Balenciaga halter dress and Saint Laurent silver pumps. (Photos from left: Brian Ach/Getty Images for Art For Life Gala, Angela Simmons via Instagram)

Rihanna, @rihanna - Tweet: "Heartbreaking news about the late Robin Williams. May his soul now be at peace!"Rih Rih was one of many celebrities to commemorate comedy vet/actor Robert Williams after he was found dead in his home Monday (Aug. 11). #DittoThatRIP(Photo: 247PapsTV / Splash News)

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Rihanna - The star breaks out her undergarment style again in NYC's Meatpacking district. This time she hits the streets wearing a black bra and white boxers. Her add-ons — a denim shirt and black, strappy sandals — dress up the look. (Photo: 247PapsTV / Splash News)