John Shearer/ Invision/ AP
Aside from the scary stuff, Halloween is also a time that brings people together—like the members of 'N Sync, for example.
Lance Bass and J.C. Chasez were photographed with Matthew Morrison, who was dressed as Justin Timberlake, so really, this was practically a boy band reunion.
Mariah Carey and "dem babies" dress up as Goldilocks and the three bears
Bass decided to dress up on the creepy side by being a scary clown with intense face makeup, while Chasez rocked an all-white beekeeper costume.
The trio linked up at Morrison's third annual Halloween bash, which was presented by Monster High, in Los Angeles on Sunday.
Other celebs that attended were Glee stars Chris Colfer, Dianna Agron, Chord Overstreet, Darren Criss and Naya Rivera, Lauren Conrad, Dancing With the Stars' Mark Ballas and Christina Milian.
No word on whether renditions of the boy band's hits were performed.
Celebs have the craziest costumes!