> Photos: Screaming with the stars at Halloween theme park events
Halloween events at theme parks around the world offer celebrities the perfect opportunity to get their haunt on while blending in with big crowds under the cover of darkness.
The ghoulish monsters, haunted mazes and holiday decorations draw some of the biggest celebrity names: Selena Gomez, Justin Bieber, Hilary Duff, Demi Lovato, Lindsay Lohan, Leonardo DiCaprio, Lady Gaga and Paris Hilton.
Here's a who's-who of stars at Halloween theme park events that you'll see in our photo gallery:
"High School Musical" star Ashley Tisdale smiles despite the bloodied ghouls gathered around during Halloween Horror Nights at Universal Studios Hollywood.
"Teenage Dreams" singer Katy Perry disguised herself with skeleton face paint to mingle with the masses during Halloween Haunt at Knott's Berry Farm. She tweeted: "Scariest night of my life! @knottsberryfarm"
"Glee" star Matthew Morrison strikes a pose with Captain Hook during Halloween Time at Disneyland.
"Lord of the Rings" star Elijah Wood seems unfazed by the trio of monsters surrounding him during Halloween Horror Nights at Universal Studios Hollywood.
"Dancing with the Stars" co-stars Ricki Lake and David Arquette scream for their lives as Ghostface attacks during Halloween Horror Nights at Universal Studios Hollywood.
"Project Runway" host Heidi Klum and her singer husband Seal sport pointy purple witch hats during Halloween Time at Disneyland.
Due to its proximity to Hollywood, Halloween Horror Nights remains the top haunt of celebrities looking for a good scare, drawing an array of stars ranging from Justin Bieber to Leonardo DiCaprio to Hilary Duff.
> Photos: Celebrities and stars at Disneyland
> Photos: Celebrities and stars at Disney World
> Photos: Celebrities play Disney characters