Christina Aguilera doesn't turn 36 until Dec. 18, but The Voice coach is already getting a head start on the birthday festivities. On Saturday, Christina was surrounded by family and friends as she rang in her birthday at a nightclub in LA. Christina went all out for her bash, rocking a multicoloured fur coat, sparkly sunglasses, and a huge pink wig. In addition to commemorating her special day with fiancé Matthew Rutler, her guests included The Real Housewives Erika Jayne and Bethenny Frankel, and pal Kylie Jenner showed up to the party dressed up as "Dirrty"-era Christina in a platinum blonde and black wig, a black and yellow striped string bikini top, and matching chaps that read "XTINA." Kylie first re-created Christina's iconic look this past Halloween, and the singer liked it so much that she asked her to do it again. The resemblance is truly striking, don't you agree?