Demi Lovato has revealed a video of herself shouting at Ben Stiller in the street.

The singer, who recently released her new album 'DEMI', uploaded the video to her personal YouTube account.

It sees the US star drive-by a group of people - including Hollywood actor Ben Stiller - in a limo on her way to record an appearance on New York's Late Night with Jimmy Fallon.

She is heard shouting: "Ben Stiller, buy my new album on iTunes! It's out now - it'll give you a heart attack. F**k yeah!"

Lovato is currently touring the US as the X Factor begins its audition stage, with their first taping taking place in Charleston, SC yesterday (May 21).

The singer is being flanked on the judging panel by Simon Cowell and the newly announced Kelly Rowland and Paulina Rubio.