Carter Baizen is “The Lost Boy” who wants everyone to think he has changed. But will Serena come around? Also, Chuck spurns Blair’s seduction. Oh, Chuck. You should KNOW better by now than to cross Blair Waldorf. Find out how it all turns out on this Monday’s “Gossip Girl” on the CW. Preview clips below.

For the next week we’ll be debuting some “Gossip Girl” promos from The CW. Today we have the season 3 teaser. So find out what’s going on with Serena, Blair, Dan, Chuck and all your other Upper East Side favorites after the jump.