Celebrity·Posted on May 21, 2013Demi Lovato Yelled Out To Ben Stiller On The Street And Told Him To Buy Her AlbumThree things...1) LOL, "Heart Attack" is playing in her car 2) Why do celebs always randomly see other celebs? 3) Isn't Demi just the best?by Lauren YapalaterBuzzFeed StaffLinkFacebookPinterestTwitterMail View this video on YouTube youtube.com Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF Tap to play GIF