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22 May 2013, 09:35 | Updated: 22 May 2013, 12:33
The X Factor USA judge is seen joking around after a chance encounter with the comedy actor.
Demi Lovato has posted a video of herself shouting at Hollywood superstar Ben Stiller to buy her new album.
The 'Skyscraper' singer is seen filming from a car when she happens to see the Meet The Parents actor on the street and quickly rolls down her window.
Demi then shouts at Ben out of the car telling him to buy her new album 'Demi', much to the bemusement of the comedy star.
"Ben Stiller, buy my new album on iTunes!" Demi shouts as they drive past. "It's out now, it'll give you a heart attack. F**k yeah!"
View a picture of Demi Lovato performing live on stage below (Credit: PA):
The X Factor USA judge recently started work on the FOX TV show this week alongside new panelists Paulina Rubio and Kelly Rowland.
Demi Lovato recently released her new single 'Heart Attack', which is currently riding high on the Vodafone Big Top 40.
Check out a clip of Demi Lovato shouting at Ben Stiller on the street below: