Best Dressed of the Week: Jessie J Shimmer's in Sexy Jumper

Plus, must-see looks from Lupita Nyong'o and others.

Jessie J - Talk about making a bang! The songstress dares to go there at the MOBO Awards in London dressed in a shimmery bronze ensemble with a slit shooting down to her navel. By Jazmine A. Ortiz (Photo: Tristan Fewings/Getty Images)

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Jessie J - Talk about making a bang! The songstress dares to go there at the MOBO Awards in London dressed in a shimmery bronze ensemble with a slit shooting down to her navel. By Jazmine A. Ortiz (Photo: Tristan Fewings/Getty Images)

Photo By Photo: Tristan Fewings/Getty Images

Chanel Iman - Eggplant is certainly the model's color! Chanel attends the God's Love We Deliver Golden Heart Awards in NYC adorned in a stellar, high-slit ,cross shoulder accented dress.   (Photo: Mike Coppola/Getty Images for Michael Kors)

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Chanel Iman - Eggplant is certainly the model's color! Chanel attends the God's Love We Deliver Golden Heart Awards in NYC adorned in a stellar, high-slit ,cross shoulder accented dress.  (Photo: Mike Coppola/Getty Images for Michael Kors)

Lupita Loves London - Lupita Nyong'o shows off her keen fashion sense as she smiles for the cameras outside of the Bally store opening on New Bond Street in London.(Photo: Beaver/Splash News)

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Lupita Nyong'o - The Kenyan beauty dons head-to-toe Bally at the store's opening on New Bond Street in London. Her orange top, pink skirt and burgundy coat are from the brand’s Spring 2015 collection. (Photo: Beaver/Splash News)

Sofia Vergara - The Modern Family actress makes an entrance at the Angel Ball 2014 in this gilded patchwork gown by Rubin Singer. Slay!(Photo: Dimitrios Kambouris/Getty Images for Gabrielle's Angel Foundation)

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Sofia Vergara - The Modern Family actress makes an entrance at the Angel Ball 2014 in this gilded patchwork gown by Rubin Singer. Slay!(Photo: Dimitrios Kambouris/Getty Images for Gabrielle's Angel Foundation)

So Very Kerry - Kerry Washington gives just a pop of color in this neoprene side-zip dress by Calvin Klein at the 21st Annual ELLE Women in Hollywood Celebration at the Four Seasons Hotel in Beverly Hills. (Photo: Michael Kovac/Getty Images for ELLE)

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Kerry Washington - The Scandal star hits up Elle's 21st Annual Women in Hollywood Celebration in Beverly Hills rocking this fierce Calvin Klein dress and Louboutin pumps. (Photo: Michael Kovac/Getty Images for ELLE)

Photo By Photo: Michael Kovac/Getty Images for ELLE

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Rocsi Diaz - As the hostess of the night, she served us two different looks at the Angel Ball 2014. We have to say our fave is this structured white number designed by John Paul Ataker.  (Photo: Rocsi Diaz via Instagram)

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Rocsi Diaz - As the hostess of the night, she served us two different looks at the Angel Ball 2014. We have to say our fave is this structured white number designed by John Paul Ataker. (Photo: Rocsi Diaz via Instagram)

La La Anthony - La's designer friend Olivier Rousteing hooks her up for the Angel Ball 2014 in NYC. The television personality flaunts the side-split of her Balmain frock on the red carpet and it's working for her. (Photo: Dimitrios Kambouris/Getty Images for Gabrielle's Angel Foundation)

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La La Anthony - La's designer friend Olivier Rousteing hooks her up for the Angel Ball 2014 in NYC. The television personality flaunts the side-split of her Balmain frock on the red carpet and it's working for her. (Photo: Dimitrios Kambouris/Getty Images for Gabrielle's Angel Foundation)

Eve - The rapper makes a rare red carpet appearance at the MOBO Awards, putting her killer legs on display in a sparkly silver mini and sexy sandals. (Photo: Tristan Fewings/Getty Images)

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Eve - The rapper makes a rare red carpet appearance at the MOBO Awards, putting her killer legs on display in a sparkly silver mini and sexy sandals. (Photo: Tristan Fewings/Getty Images)

C'est Chic - Rihanna gets dolled up in all black with striped Manolo Blahnik pumps and a Chanel clutch while dining at DaSilvano, her favorite restaurant in NYC.(Photo: TS, PacificCoastNews)

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Rihanna - It's the accessories that make Rih's geek-chic getup really pop. Dior gloves, a Chanel purse and Manolo Blahnik kitten heels complete her New York City style. (Photo: TS, PacificCoastNews)

Gugu Mbatha-Raw - The Beyond the Lights actress arrives at Elle's 21st Annual Women in Hollywood Celebration in Beverly Hills styled to perfection in Calvin Klein, nude strappy heels and a gold clutch. (Photo: Frazer Harrison/Getty Images)

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Gugu Mbatha-Raw - The Beyond the Lights actress arrives at Elle's 21st Annual Women in Hollywood Celebration in Beverly Hills styled to perfection in Calvin Klein, nude strappy heels and a gold clutch. (Photo: Frazer Harrison/Getty Images)