News Kendall Jenner Flashes Her Butt (Again) in Lacy Two-Piece at Masquerade Ball By Desiree Murphy 5:24 PM PDT, October 10, 2015 Now Playing hh:mm:ss She may not have the most famous butt in the Kardashian family, but that doesn't stop Kendall Jenner from flaunting it.The 19-year-old model bared her booty at a fancy masquerade ball held in honor of designer Roberto Cavalli's wife, Eva, on Friday at One Mayfair in London.Getty Images WATCH: Kendall Jenner Poses Topless: 'I'm Washing Away My Sins'Jenner looked very chic, wearing a navy bralette and a sheer lace skirt over high-waisted briefs -- which hardly covered her backside. She topped off the look with a velvet blazer.Inside the party, Kendall was joined by her best friend and fellow model, Cara Delevingne. The two were both photographed wearing matching lacy masks to fit the party's theme.Getty Images WATCH: Kendall Jenner Bares Her Booty at Paris Fashion WeekCara's sister, Poppy, was also in attendance, and the three snapped an adorable pic with the birthday girl."Unforgettable night," Eva captioned the photo. View this post on InstagramUnforgettable Night!#evabdaywonder ❤️ @caradelevingne @poppydelevingne @kendalljennerA post shared by Eva Cavalli (@eva_cavalli) on Oct 10, 2015 at 7:29am PDTCara, 23, also took to Instagram to share some highlights from the night, like this artsy close-up of Jenner's bum. "Piece of CaKe," she wrote. WATCH: Khloe Kardashian Shows Off Booty in Sexy Swimsuit"Face off," Cara captioned another photo of the masked beauties. View this post on InstagramFace off 🎭 📷 taken by @toricookiA post shared by Cara Delevingne (@caradelevingne) on Oct 9, 2015 at 3:26pm PDTThis isn't the first time Kendall's gotten cheeky in public. Watch the NSFW video below to see another one of Kendall's shockingly sheer outfits. Kendall Jenner Rocks a Sexy Thong in See-Through Pants and Totally Owns it!