It was the hottest spot to stargaze last night as celebs flocked to the Casamigos Halloween party at the home of Mike Meldman in Beverly Hills (October 25).

Among the attendees were Elisabetta Canalis, who was feeling heroic as Wonder Woman while Ryan Seacrest exuded mystery as the Phantom.

Looking adorable with her hubby Mike Comrie, Hilary Duff dressed as a mouse as she held the hand of her doctor.

Nearby, Selena Gomez looked positively angelic as Derek Hough sported a mohawk and punk ensemble. Arriving with his equally dashing brother, Maksim Chmerkovskiy donned a colonial outfit. Check out all the costumes below.