Demi Lovato 'Twerks' for Simon Cowell on 'X-Factor' Set [VIDEO]: 'Heart Attack' Songstress Shakes Booty in Judge's Face to 'Baby Got Back,' Sexier than Miley Cyrus? [POLL]

During auditions for the "X-Factor" season three in Long Island, NY on Thursday (June 20), "Heart Attack" songstress Demi Lovato surprised fellow judge Simon Cowell with a funky "twerk" lap dance! Lovato shook her booty in Cowell's face as the audience amusingly cheered her on during a "Baby Got Back" dance break. Watch the "twerking" clip below... does Lovato shake her thing better than fellow pop starlet Miley Cyrus?

Check out the "X-Factor" judges dance to Sir Mix-a-Lot's bootylicious hit "Baby Got Back" while taking a break on-set. Near the end of the clip, Lovato twerks (sort of) to the shock and amusement of Simon Cowell!

The "twerking" video's already received over 22,000 views on Youtube. According to some fans, the "Queen of Twerking" Miley Cyrus could actually learn a thing or two from Lovato!

babygirl9501: "Miley, learn how to werk from the one and only demi lovato."

beachgal9: "Miley, imma let you finish..BUT DEMI DID THE BEST TWERKING OF ALL TIME."

BitchesLoveMiley: "Hahhaha I think Miley taught Demi how to twerk! LOVE them both but...Miley is really twerking her a## off! :) Wish they both make a video twerking together!"

Do fans agree? Twerking face-off time, Lovato vs. Cyrus?