Ed Westwick  Ashley Greene twilight gossip girl cigarettes gas station

Whoa!!!

Mr. Gossip Girl was looking a little light in his loafers Saturday night and we don't mean anyway other than that he could hardly stand up!

A pal supported Ed Westwick into a convenience store in Hollywood while two brunettes waited for the British bad boy in the car -- and neither one of them, by the way, appears to be his girlfriend and co-star Jessica Szohr!

Ed Westwick  Ashley Greene twilight gossip girl cigarettes gas station

Our photog had this to say about Westwick's sad state: "The boy had definitely been drinking ... or something. He was out of it but trying to keep that British serious face going while he went in to make a purchase. He kind of hid the package behind him and faced the cameras while the clerk bagged the condoms. He was smooth, but we knew what he was up to."

Ed Westwick  Ashley Greene twilight gossip girl cigarettes gas station

What's up with THAT?! What happened to Jessica? Is Ed living out the real-life Chuck Bass or what?!