Anticipation started building for “Burlesque” the moment the cast list was announced — Christina Aguilera, Julianne Hough, Stanley Tucci and, of course, Cher. Impatience set in when Cher showed up at the VMAs to promote the film, still able to rock her old black leather get-up at the mature age of 64. With this new clip of Aguilera, it’s time to get flat-out anxious.

It’s back to classic Christina, who landed the lead role of Ali in the upcoming musical drama. After a long day of work, the singer decides to unwind with a little karaoke. As should be expected, when Aguilera takes the stage — even if it is a dingy diner platform — it’s no amateur hour or casual shower singing performance.

As soon as she opens her mouth Aguilera’s powerhouse smoky vocals own Etta James’ “Something’s Got a Hold On Me.” The former pop princess parades around her make-shift stage with an unplugged microphone, treating the empty diner to some stellar “hairography” — whipping her blond locks and bouncing to the music. Gripping her chair for purchase, Aguilera ends the song with an intense vibrato note and collapses promptly on the floor after a job well done.

“Burlesque” opens in theaters Nov. 24. We’ll just have to keep X’ing the days on our calendar.

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