This is pretty hilarious.
During a recent visit to New York City, Demi Lovato was driving around and shouting at fans to buy her new album… when she spotted movie star Ben Stiller and screamed the very same message to him.
"It's out now," she told the actor. "It'll give you a heart attack."
Lovato then ducked her head back inside the window, cracked up and even let out a curse in delight. It's pretty funny. Watch now: