Best Dressed of the Week: Nicole Richie Blossoms in Blue

Plus, must-see looks from Rihanna, Nicki Minaj and others.

Nicole Richie - The Candidly Nicole star hits Good Morning America with baby blue strands and a coordinating Erdem floral frock. By Jazmine A. Ortiz  (Photo: Santi/Splash News) 

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Nicole Richie - The Candidly Nicole star hits Good Morning America with baby blue strands and a coordinating Erdem floral frock. By Jazmine A. Ortiz (Photo: Santi/Splash News) 

Photo By Photo: Santi/Splash News

All About the Boots - Karrueche Tran rocks a fly pair of over the knee leather sandals while out with friends having lunch at the Grove in Hollywood, CA. (Photo: Splash News)

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Karrueche Tran - Kae brings sexy back for her appearance on Just Keke. Side-slit tee, check. Gucci short-shorts, check. Thigh-high boots, check. We're in love with this look. (Photo: Splash News)

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Gwen Stefani - The L.A.M.B. designer blazes the L.A. streets in an eye-popping blue ensemble. Everything from the bold pattern of her outfit to her electric sunnies screams — fierce! (Photo:  Devone Byrd, PacificCoastNews)

Photo By Photo:  Devone Byrd

Joan Smalls - Showcasing her supermodel legs, Joan graces Vogue Paris Foundation Gala in a snakeskin top and sheer-pleated skirt from Givenchy’s Fall 2014 collection.  (Photo: Richard Bord/WireImage)

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Joan Smalls - Showcasing her supermodel legs, Joan graces Vogue Paris Foundation Gala in a snakeskin top and sheer-pleated skirt from Givenchy’s Fall 2014 collection. (Photo: Richard Bord/WireImage)

Brandy - The Game star chats on the couch at Just Keke wearing an adorable cocktail dress that she pairs with bright orange pumps. Pop!  (Photo: Patrick Wymore/BET Networks) 

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Brandy - The Game star chats on the couch at Just Keke wearing an adorable cocktail dress that she pairs with bright orange pumps. Pop! (Photo: Patrick Wymore/BET Networks) 

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Jennifer Lopez - Jenny from the block channels Audrey Hepburn in this blush monochromatic peplum skirt and floral-embroidered top, both by Zuhair Murad, to meet Michelle Obama at the League of United Latin American Citizens Luncheon in New York City.  (Photo: Larry Busacca/Getty Images for NUVOtv)

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Jennifer Lopez - Jenny from the block channels Audrey Hepburn in this blush monochromatic peplum skirt and floral-embroidered top, both by Zuhair Murad, to meet Michelle Obama at the League of United Latin American Citizens Luncheon in New York City. (Photo: Larry Busacca/Getty Images for NUVOtv)

Jessica Alba - Jess suits up in a cream blazer and purple pants, but what we’re really adoring are her stellar accessories. The star’s Smythson 1887 tote and Monique Lhuillier sandals are to die for.  (Photo: WENN.com)

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Jessica Alba - Jess suits up in a cream blazer and purple pants, but what we’re really adoring are her stellar accessories. The star’s Smythson 1887 tote and Monique Lhuillier sandals are to die for. (Photo: WENN.com)

Nicki Minaj - For the debut of her latest fragrance, Minajesty Exotic Edition, on HSN, the Young Money MC dons a figure-flaunting dress by Fausto Puglisi, shoes by Versace and jewelry from Tom Ford and Michael Kors.  (Photo: Nicki Minaj via Instagram)

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Nicki Minaj - For the debut of her latest fragrance, Minajesty Exotic Edition, on HSN, the Young Money MC dons a figure-flaunting dress by Fausto Puglisi, shoes by Versace and jewelry from Tom Ford and Michael Kors. (Photo: Nicki Minaj via Instagram)

Princess of Pop - Rihanna walks through the streets of NYC in a bubble gum pink slip dress. (Photo: Blayze / Splash News)

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Rihanna - Only Rih… The singer makes the list for being the sole person on this planet who can sport a nightie in broad daylight and still look hot. She turns heads in NYC, pairing her lingerie slip dress with black converse and a denim jacket. (Photo: Blayze / Splash News)

Kim Kardashian - Mint green is in and Kimmy knows what’s up! North’s mama arrives at Paris Fashion Week in this stunning, on-trend Valentino gown.  (Photo: Pascal Le Segretain/Getty Images)

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Kim Kardashian - Mint green is in and Kimmy knows what’s up! North’s mama arrives at Paris Fashion Week in this stunning, on-trend Valentino gown. (Photo: Pascal Le Segretain/Getty Images)