VIDEO : Kylie Jenner Dresses Up Like Christina Aguilera, Again!

Instagram Birthday girl Christina Aguilera came face-to-face with her new doppelganger, and perhaps protégé, Kylie Jenner. The pop star celebrated an early 35th birthday at a massive surprise party Saturday night and the 19-year-old Keeping Up With the Kardashians star and her BFFs were among the guests. Kylie dressed up like Christina did at her performance of "Dirrty" on her MTV's TRL Presents: Christina Aguilera Stripped in NYC 2002 special, wearing a long, platinum blonde and black wig, a black and yellow striped string bikini and matching arm bands, plus chaps that read "XTINA."