"Uh-oh, could another JoBro be off the market?

Joe Jonas and Ashley Greene were snapped arriving in LAX last night after spending the holidays with the Twilight star's family in Florida. Ash had her hands full with her dog, Marlow...and a gold ring on that finger!

So did Joe pop the question?

Not so much.

The stars' reps haven't responded to requests for comment, but a source close to the couple tells E! News that it's not an engagement ring.

Whew! JoBros fans can breathe a sigh of relief.

(And besides, that flower ring doesn't look like much of an engagement ring anyway.)

Joe and Ashley will be heading to Sin City for the Coldplay concert tomorrow night—let's see if she comes back with a different kind of ring on her finger!