Demi Lovato faced off against host Jimmy Fallon in his game 'Wheel of Musical Impressions' on Friday's Tonight Show.<br />41-year-old Fallon, a seasoned impressionist and SNL veteran, did predictably fantastic renditions of Louis Armstrong and Dave Matthews.<br />But Lovato brought the house down when she belted the SpongeBob Squarepants theme song just like pop rival Christina Aguilera.<br />Rocking a big cat bomber jacket, Demi - born Demetria - effortlessly emulated the over-the-top vibrato typically used by the 35-year-old blonde.<br />'Oh my goodness, that is unbelieveable!<br />Game over, game over!<br />I can't top that!'<br />Jimmy announced to his cheering studio audience.
