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Kylie Jenner Dresses Up as ‘Dirrty’ Era Xtina (Again) for Christina Aguilera’s Birthday

The best form of flattery. Kylie Jenner dressed up as “Dirrty”-era Xtina (again) for Christina Aguilera’s birthday bash on Saturday, December 10.

The Keeping Up With the Kardashians star, 19, donned a tiny black-and-yellow bikini top, thigh-high black boots and black-and-yellow pants that showed off a peek of her bum as a tribute to the legendary pop star, who will turn 35 on December 18.

Related: PHOTOS: Kylie Jenner's Best Selfies: A Definitive Ranking

“Happy Birthday @xtina !!!!!! 💋💋💋,” Jenner captioned a video clip she posted to Instagram, in which she (with black and blonde extensions) smiles and cozies up to Aguilera at a lavish neon party. In the video, Aguilera dons an oversize pink wig, a furry coat and sparkly sunglasses.

Happy Birthday @xtina !!!!!! ???

A post shared by Kylie (@kyliejenner) on

The pair air kiss and pose for photos on a white couch, with hot pink balloons framing their silhouettes.

Related: PHOTOS: Christina Aguilera's Body Evolution

In another photo, Jenner poses with her BFFs Jordyn Woods and Tiffany Sorya at the glam bash. Earlier in the night, the Lip Kit creator even shared some behind-the-scenes Snapchats of herself getting ready for the event while blasting Aguilera’s album in the background.

Birthday Bae

A post shared by Kylie (@kyliejenner) on

Jenner first transformed into the circa-2002 pop star for Halloween, donning a similar outfit (but in that case, red and black) for a Pac Sun–sponsored party that weekend.

Related: PHOTOS: '90s Pop Stars, Then and Now

“Genie in a Bottle” singer Aguilera was so thrilled about the tribute that she reposted Jenner’s original image with a caption:

"YAASSSSS"…..Killin it @kyliejenner yes to dirrty 2016!! Get it girrrl!!! 👏👏☠️😈👻😻💋."

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