Matthew Morrison, Christina Aguilera

Courtesy of WireImage

Divorce didn't put a damper on Christina Aguilera's Halloween spirit!

The newly single singer hit up Richard Simmons Matthew Morrison's private bash at Voyeur presented by Onitsuka Tiger dressed as a sexy cop last night.

Xtina came with some of her dancers and enjoyed the live band. Another famous blonde friend of Matthew's was rumored to be there as well, but...

Cameron Diaz didn't attend the party.

Fellow Gleeks Chord Overstreet and Harry Shum Jr. were in the house, along with Lauren Conrad, who was having some costume issues.

"She was dressed as a bird and had trouble drinking with her beak on," an onlooker said.

Meanwhile, other stars danced with the dead over at the Hollywood Forever cemetery, where Maroon 5 hosted their own spooky soiree.

Bacardi-serving bars and a dance floor were set up amongst the graves.

Kellan Lutzdonned a wrestler costume and seemed to be doing just fine despite his split from AnnaLynne McCord.

Austin Nichols and Sophia Bush, who dressed as Russell Brand and Katy Perry, stuck by each other sides at the soiree.

Mischa Barton was also spotted roaming around, although no one could really tell what her costume was. Since she normally dresses pretty scary anyway, maybe she thought she didn't need a disguise?

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