Scarlett Johansson
The actress' Captain America: Civil War costar gave her a scream when he surprised her on The Ellen Show.
Josh Hutcherson
The Hunger Games star looks a bit frightened when he finds himself in the clutches of the monsters at Universal Studios.
Selena Gomez
The "Good for You" singer got a scare from someone dressed like her bestie Taylor Swift.
Lea Michele
Poor Lea! The Glee alum and Scream Queen star got the fright of her life, courtesy of Michael Meyers.
Trai Byers & Grace Gealey
The Empire costars and real-life couple protect each other from the crazy creatures running around Halloween Horror Nights.
Kristen Wiig
As it turns out, the Ghostbuster star is afraid of ghosts!
Kylie Jenner and Tyga
The celebrity couple explored the haunts at Halloween Horror Nights to get into the spooky spirit.
Jimmy Fallon
The Tonight Show host was not expecting Ellen to pop out, but a hidden camera captured everything.
Ashley Tisdale, Shenae Grimes & 5 Seconds of Summer
The actresses had a spooky group outing with the musical group during their trip to Halloween Horror Nights at Universal Studios.
Ed Westwick
The Gossip Girl alum looks a little too calm at the sight of his friend getting a bloody chainsaw to the throat.
Emily Blunt
Becoming an American citizen shouldn't be so scary, but unfortunately that wasn't the case for the Edge of Tomorrow actress.
Sabrina Carpenter
The Disney Channel star looks ready to take on the scares at Universal Studios' Halloween Horror Nights.
Channing Tatum
The hunky actor had to go face-to-face with his biggest fear: a porcelain doll.
Ashley Green
The Twilight alum manages to look beautiful posing next to a duo of creepy creatures.
Wilmer Valderrama & Mandy Moore
The ex-couple pose in front of the Psycho house during their night at Universal Studios.
Chloë Grace Moretz
The Kick-Ass star is surrounded by chainsaw-wielding maniacs while checking out the haunted mazes at Halloween Horror Nights in Universal City, Calif.
Jennifer Lopez
Ellen teams up with a cougar to scare the singer, who still looks flawless even when she's screaming.
Ashley Benson
The Pretty Little Liars beauty lets out a blood-curdling scream during a trip to Halloween Horror Nights at Universal Studios Hollywood.
Ariana Grande
The Scream Queens actress poses for a shot after a screaming good night at Halloween Horror Nights in Orlando.
Miley Cyrus
The "Wrecking Ball" singer got a shock when a Robin Thicke lookalike snuck up on her while she appeared on The Ellen DeGeneres Show.
David Arquette
He might be a Scream star, but it's nothing but laughs from the actor right before he enters The Walking Dead maze.
Jennifer Aniston
Scream's iconic Ghostface elicits a scream from the actress while she chats with Ellen DeGeneres.
Jake Gyllenhaal
The Southpaw stud is scared stupid by the creepy doll that pops out from behind his chair.
Dylan Minnette
Even the Goosebumps star can't hold back a scream at opening night at Universal Studio Hollywood's Halloween Horror Nights.