Treat or treating is going glam this year, with Lady Gaga costumes all the rage according to Party City. And 'Jersey Shore' costumes aren't too far behind.

We are so answering the door.

"This year, avant-garde hits mainstream and, as a result, 2010 costumes are expected to be really over the top," says Melissa Sprich, top costume designer for Party City. Sprich notes that "more than ever, the latest runway shows and fashion-forward individuals mega-influence costume trends. And, as always, this year's hit blockbusters and outlandish pop figures [hello, Snooki!] strongly influence costume trends, as people love taking on a completely different persona for Halloween."

Here's a spooky coincidence: That's the same take Barneys Creative Director Simon Doonan gave StyleList when he talked to us about his reality-television-inspired Halloween collection for Target.