Andy Lassner

Ariana Grande can't keep her cool in Ellen DeGeneres' haunted house

Armed with Ellen DeGeneres' executive producer Andy LassnerAriana Grande stepped into the American Horror Story Maze at Universal Studios Horror Nights prepared for a sight—and more than a few frights. 

Killer clowns, spooky skeletons and a bevy of other creepy creatures lurked around every corner waiting to catch the pop singer when she least expected it.