Reality TV star Kylie Jenner has some explaining to do after locking lips with R&B veteran Christina Aguilera.

Jenner helped Christina turn 36 this past Saturday (December 10) at her birthday bash and kissed the R&B hottie.

Happy Birthday @xtina !!!!!! ๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹

A post shared by Kylie (@kyliejenner) on

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Back in October, Jenner dressed up as Aguilera for Halloween.

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