Sexy Stars: Week of May 5, 2015

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Sexy Stars: Week of May 5, 2015

Sienna Miller always brings a touch of class to the red carpet, even with this super deep plunge!

(Photo by James Mccauley/Invision for the Hollywood Reporter/AP Images)

Doutzen Kroes, 30, stunned in a sleek and sexy white gown with high slit and fluid cut out. 

(Photo by Joel Ryan/Invision/AP)

Julianne Moore, 54, wowed in a breathtaking beaded creation with a deep plunge. Talk about Hollywood glam!

(Photo by Joel Ryan/Invision/AP)

Wow! Rebecca Romijn, 42, looked killer in a fun dress with circular cut-outs.

(Photo by Evan Agostini/Invision/AP)

Peekaboo! Jennifer Lopez, 45, turned heads in a lacy gown that showed off some skin. 

(Photo by John Salangsang/Invision/AP)

Charlize Theron, 39, was a showstopper in a canary yellow fitted gown with a dramatic train. Old Hollywood waves and simple jewels completed the South African stunner's gorgeous look.

(Photo by George Pimentel/WireImage)

Now that's a jumpsuit! Actress Rachel Weisz, 45, looked very put together in the simple yet sexy piece. Undone hair, pink lips and fringe earrings completed the classic look.

(Photo by Arthur Mola/Invision/AP)

Kylie Jenner, 17, rocked a mature white gown with a thigh-high slit.

(Photo by Evan Agostini/Invision/AP)

Kym Johnson, 38, was glowing on the red carpet. Fresh from vacation with rumored beau and "DWTS" partner Robert Herjavec, we'd say it's a combination of a new tan and touch of love.

(Photo by Paul Archuleta/FilmMagic)

Candace Cameron-Bure, 39, matched her lips to her dress -- or vice versa.

(Photo by Paul Archuleta/FilmMagic)

Kerry Washington, 38, was pretty as a picture in a yellow and gray floral dress.

(Photo by Greg Allen/Invision/AP)

Colin Farrell, 38, smoldered in a light gray three-piece suit with darker shoes and a matching pocket square.

(Photo by Arthur Mola/Invision/AP)

Ian Somerhalder, 36, looked stylin' in dark skinny slacks, a crisp white shirt and a light gray blazer. And we're big fans of that sexy scruff!

(Photo by Taylor Hill/FilmMagic)

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With Cannes Film Festival and network upfronts (TV advertising sales parties) underway, stars are putting their best foots forward on the red carpet.

Sienna Miller, who usually likes to stay covered up, wowed at Cannes in a flirty black dress with a deep plunge in the front. The actress, 33, who is a juror at the festival, paired her LBD with satin heels and wavy hair.

Model Doutzen Kroes, 30, also turned heads on the red carpet in a sleek white gown with a thigh-high slit and fluid cut-out.

See more sexy celeb styles in the gallery above.

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