Christina Aguilera sings “Tight Pants” on Fallon while Bieber takes on “Uptown Funk” with James Corden.


Xtina and the Biebs sang silly skits on late night TV following the GRAMMYs on Monday.

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Christina Aguilera dropped by The Tonight Show Starring Jimmy Fallon to sing a bit of “Tight Pants” alongside Will Ferrell and Fallon. She confidently says “Don’t mess with the lioness,” but we can’t help but think she’s recreating her *** & The City Samantha impression.

Justin Bieber cruised to the GRAMMYs with James Corden, and on the way participated in a little Carpool Karaoke to Mark Ronson and Bruno Mars’ “Uptown Funk” which took home a Grammy for Record Of The Year.

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