Kim Kardashian and Kendall Jenner both turned up the heat — Vegas style — for a night out celebrating the grand opening of the Fontainebleau Las Vegas and Justin Timberlake concert.

For their evening in Sin City, the sister duo both chose all-black looks, starting with complementary 𝑠e𝑥y dresses. Jenner wore a floor-length halter slipdress with a plunging neckline, structured bodice and flirty hem, while Kardashian picked a floor-length figure-hugging knit dress. Her garment clung to all her curves and showed hints of skin, also dipping down just low enough to give a tease of cleavage. It is Vegas, after all!

Kim Kardashian in Las Vegas.

DAVID BECKER/GETTY

While Jenner, 28, went jewelry-less for the night, Kardashian, 43, amped up her look with a few pieces, including a silver necklace and some rings. Jenner did carry a matching black bag, though to dress up her look. Kardashian only had her phone and her ticket in hand (apparently leaving her giant $110K Birkin at home for this trip).

For glam, both sisters went the same route: long hair down and flowing with soft makeup and a nude, natural lip color.

Kendall Jenner in Las Vegas.

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Timberlake headlined the invite-only — and very star-studded — event. The Grammy winner performed a set of his hits to a crowd that included Cher, Tom Brady and Lenny Kravitz.

Jessica Biel was also in attendance and was her husband’s biggest supporter during the set as she applauded, sang along and danced while Timberlake cycled through some of his most-loved songs.

He opened the set with “SexyBack” and went on to sing “Like I Love You,” “Rock Your Body,” “Señorita,” “Suit and Tie” and “Cry Me a River.” He concluded the show with “Mirrors.”

Justin Timberlake performing, as shown in Kim Kardashian’s Instagram Story.

KIM KARDASHIAN/INSTAGRAM

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Kardashian and Jenner sat beside Ivanka Trump as they watched the concert from their seats. At one point, Kravitz stopped by the Kardashians stars to say hello. Kardashian also showed off a glimpse of the exclusive evening on her Instagram Story, sharing a video of the ‘NSYNC singer performing his solo hits (while also dressed to the nines in his black and white tux).