Miley Cyrus

Christopher Polk/Getty Images for Clear Channel

Close your eyes Mrs. Claus. 

Miley Cyrus gave Santa more than he bargained for when she performed at KIIS FM's Jingle Ball Friday, twerking in front of Old Saint Nick in a black sequined crop top and high-cut sequined briefs.

"You are a VERY BAD Santa @CheyneThomas," Miley tweeted Saturday, along with a photo of herself dancing in front of the costumed Santa.

The 21-year-old singer closed out the LA radio station's annual event, hitting the stage to croon "We Can't Stop," "Party in the USA," "#GetItRight" and a cover of Lana Del Rey's hit song "Summertime Sadness" into a candy cane-covered microphone. 

Miley Cyrus, Robin Thicke

Rich Polk/Getty Images for Clear Channel

And although Robin Thicke didn't join Miley on stage this time, the duo did have a reunion of sorts backstage, where they were spotted chatting with each other and laughing. 

In addition to the naughty Santa though, Miley was accompanied by dancers suited up in reindeer ears and high-cut white onesies, as well as a dancing Christmas tree.

Miley Cyrus, Calvin Klein Collection

© 2013 JB Lacroix/WireImage

Earlier in the night, the "We Can't Stop" crooner bared her midriff on the red carpet, striking a fierce pose in a Calvin Klein black cropped halter top and long black skirt. 

Happy Holidays indeed. 

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