Christina Aguilera's Birthday Included an Impersonation by Kylie Jenner and an Erika Jayne Performance

Bethenny Frankel also made a cameo.

Christina Aguilera and her guests gave zero f***s when it came time to celebrate the singer's 36th birthday. From the star-studded guest list — Kylie Jenner as vintage Christina Aguilera (per the singer's request after Kylie's incredible Halloween costume) and The Real Housewives of New York City's Bethenny Frankel — to the incredible performance (we'll get to that), the party was obviously off-the-hook.

Birthday Bae

A photo posted by Kylie (@kyliejenner) on

A photo posted by Matthew Rutler (@m_rutler) on

Did we forget to mention that Erika Jayne even performed?

Serving up some birthday love last night for Queen @xtina ??????????

A photo posted by Erika Jayne (@theprettymess) on

Heck, even Santa looked more naughty than nice at the bash. Perhaps having a latex-clad Bethenny on his lap inspired the mood.

California & @xtina know howta party

A photo posted by Bethenny Frankel (@bethennyfrankel) on

Xtina simply slayed in her outfit, which looks like it was inspired by the board game Candy Land, Marie Antoinette, and Elton John.

Get ready to party kiddies! ??????

A photo posted by Christina Aguilera (@xtina) on

Get a load of more Xtina, below.

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Erika Girardi Bethenny Frankel Christina Aguilera Kylie Jenner