This season's "X Factor" judges' panel is heading to be all forms of fun, with Demi Lovato and Britney Spears signing up for LA Reid and Simon Cowell.

And for the duration of a recent promo clip, the "Skyscraper" singer pulled a humorous prank on Cowell through one particular contestant's audition.

When requested to weigh in on a singer, Demi chuckled just before admitting, "I have like 12 mints in my mouth."

And when Simon criticized her antics, Lovato spit the mints into his hand, prompting him to respond, "Really, truly grown up Demi… obnoxious tiny brat."