Katy Perry joined a group of girlfriends Sunday for a night out at the Los Angeles Haunted Hayride.
Before embarking on a private hayride, Perry and crew met up with Fashion Police host George Kotsiopoulos and his friends.
Wearing ponchos to protect them from the splatter and gore, the group headed into a haunted maze.
"Katy was in there for about 30 minutes!" an onlooker tells PEOPLE. "She seemed to be having a ton of fun and shared lots of laughs with her friends."
"She loved being scared by all of the characters each time they snuck up on her!" the source adds.
– Melody Chiu