Should the Kylie Cosmetics empire crumble, Kylie Jenner has a promising career as a Christina Aguilera impersonator to look forward to.

Jenner dressed up as Aguilera in her "Dirrty" video for Halloween and Xtina liked what she saw, so she invited Kylie (Kristina?) to her birthday bash. And when it was about time for Jenner's arrival, she killed it, yet again.

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This is a different look that the one she wore on Halloween, which hopefully means that Jenner has an entire closet dedicated to Christina Aguilera cosplay -- a perfect way for a rich 19-year-old to spend her money.

The Jenner sisters are happy to pay respect to those who made their celebriteen lives possible and frequently honor pop culture history.

Kendall dressed up like Paris Hilton at her 21st birthday party, recreating a look from 2002. "Dirrty" was released in 2002 as well. Why are the Jenner sisters so obsessed with the year 2002? We may never know.

Meanwhile, Xtina herself wore some pretty dope gloves to the party just ahead of her 35th birthday on Dec. 18.

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We hope you had a great birthday, Xtina, and got both what a girl wants and what a girl needs.