It looks like former cast member Taylor Momsen and Connor Paolo will be returning to the Upper East Side for the Gossip Girl series finale December 10. Kelly Rutherford posted the evidence on Instagram today!

It's unclear what exactly brings these two departed characters back from wherever they are (an extended stay in the Hamptons, perhaps, if you're a Revenge fan), but both will be on hand for Gossip Girl's swan song.

Actually, we do have a pretty good idea what may bring the whole gang back together. If you've missed the Gossip Girl finale set photos we posted yesterday - and just updated - consider this a major spoiler alert.

Then follow the link and let the speculation run rampant!

And welcome back, Lil J and Eric!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.