Kylie Jenner arguably won Halloween 2016 when she stepped out in this spot-on costume of Christina Aguilera from her "Dirrty" music video, circa 2002 (an iconic moment in 2000's pop culture). She got everything from the chaps, to the black-and-blond braids to the (fake) lip piercings down.

But what did Xtina herself think of the outfit? After word spread of Kylie's accurate "Dirrty" tribute, Aguilera reacted to the 19-year-old's costume last night with nothing but straight praise. She even reposted Jenner's photo on her own Instagram and enthusiastically captioned: "YAASSSSS".....Killin it @kyliejenner yes to dirrty 2016!! Get it girrrl!!! 👏👏☠️😈👻😻💋"

Kylie was merely five years old when a then-22-year-old Xtina released the provocative music video, but the teen clearly did her research.

Erica Gonzales is the Senior Culture Editor at ELLE.com, where she oversees coverage on TV, movies, music, books, and more. She was previously an editor at HarpersBAZAAR.com. There is a 75 percent chance she's listening to Lorde right now. 

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