New Couple Alert? Ed Westwick & Allison Mosshart

(WireImage.com (both))

Could Gossip Girl cutie Ed Westwick have a new love interest? Our spies say yes!

While out at Lollapalooza this weekend, Westwick was spotted hanging with The Kills front woman Allison "VV" Mosshart. The two reportedly spent the entire weekend together before Westwick had to head to L.A. for Sunday night's Teen Choice Awards.

So how serious are they? An insider tells OK!, "It's very new but they make a cute couple! They are definitely more than friends!"