The 26-year-old DNCE singer was dressed up as Chazz Michael Michaels, the character that Will Ferrell plays in Blades of Glory, and he was joined at the event by his pal Wilmer Valderrama, who dressed as himself.
Derek Hough was seen hanging out with the guys and he was dressed as a skeleton.
Other guys in attendance at the part included Jake Miller as an Olympian, Brant Daugherty as Clark Kent, Sinqua Wills as Fetty Wap, Ryan Beatty as a greaser, and Travis Tope as a dog, as well as actor Stephen Lunsford and singer Matt Carrie.
There was a Guitar Hero Live room inside the party where guests were able to battle it out to some of the hottest songs out there. See a photo of JJ‘s Jared Eng in one of the booths below!