Kourtney Kardashian Works Post-Baby Body, Kendall Jenner Flashes a Peek of Skin in Sexy Styles at Justin Bieber Roast

Kendall Jenner and Kourtney Kardashian on March 14, 2015.
Kendall Jenner and Kourtney Kardashian (working her post-baby body) had a sisters' night out at the Comedy Central Justin Beiber roast on March 14, in L.A. Jeff Kravitz/FilmMagic

Sizzling at the roast!

Celebrities, including Kevin Hart, Martha Stewart, and Will Ferrell, dished out some biting humor at Justin Bieber‘s Comedy Central roast. But, fear not, the “Baby” singer, 21, still has a few friends—and stylish ones at that!

PHOTOS: Justin's biggest scandals!

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Kourtney Kardashian and Kendall Jenner both attended the Los Angeles event (which was filmed this past weekend and will air on March 30), and the half-sisters—and longtime Bieber supporters—turned it out for the occasion. 

PHOTOS: Kendall's sexiest bikini shots

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Kourtney Kardashian - Bieber Roast
Kourtney Kardashian showed off her curvy post-baby body at the afterparty for Comedy Central’s roast of Justin Bieber at Sony Pictures Studios on March 14, in L.A. Jeff Kravitz/FilmMagic

Three months after giving birth to her third child, Reign, Kardashian, 35, stepped out, flaunting her curvaceous post-baby body in a fitted black dress with a white bib and big, black bow.

PHOTOS: Kourtney's maternity style

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Meanwhile, Jenner, 19, who had been in Paris for Fashion Week just days before, worked her effortless, off-duty-model style in an off-the-shoulder gray top, teamed with a black pencil skirt and snakeskin, lace-up heels. Adding a pop of color, the Estee Lauder model also applied a red statement lip.

Justin Bieber and Kendall Jenner
Justin Bieber and Kendall Jenner (clad in an off-the-shoulder top) headed into the afterparty for Justin Bieber’s roast in L.A. on March 14. Jeff Kravitz/FilmMagic

Both ladies were spotted laughing throughout the evening—where, at one point, Jeffrey Ross anointed Bieber the “King Joffrey of pop”—but they still stepped up to the stage to warmly greet Bieber, who was clad in a royal blue suit. 

PHOTOS: Kendall's best runway moments

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The half-sisters also met some of the comedians who came out to rip the star apart, including Hart and Stewart, who posed with the runway star and the mom of three for photos.

Kourtney Kardashian, Kendall Jenner and Martha Stewart - Bieber Roast
Kourtney Kardashian and Kourtney Kardashian pose with one of the night’s comedians, Martha Stewart, at Justin Bieber’s roast on March 14, in L.A. Christopher Polk/Getty Images

At the end of the night, Bieber apologized for his questionable behavior over the past few years—but he had the last laugh, too. After the comedians spent an hour teasing the star, the “Beauty and the Beat” crooner quipped, “What do you get when you give a teenager $200 million? A bunch of has-beens calling you a lesbian for two hours.”

What do you think of Kardashian and Jenner’s roast style? And will you tune in to the roast? Tweet with @UsWeekly using the hashtag #stylebyUs!

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