Kendall Jenner flashes her butt (again) in lacy two-piece

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.