Kylie Jenner got down and dirty in her skimpiest Halloween costume yet. Because one costume isn’t enough, Kylie ditched yesterday’s conservative look to dress up as Christina Aguilera from her 2002 Dirrty music video. With long blonde hair extensions, an all-American striped string bikini, red pants and chaps, Kylie was the spitting image of the pop princess at the Bootsy Bellows Halloween party in LA.