Gossip Girl returns Monday - and so does Jenny - in "Easy J." If you haven't seen it, check out this episode preview courtesy of show-runners Stephanie Savage and Joshua Safran.

The following week, Blair is caught off guard – and not in a positive way – by a surprise guest at her birthday party in "War at the Roses" (clever play on words as always by GG).

Having had enough of Chuck and Blair’s games, Serena and Nate plan an intervention. Will it be successful? Will Dan really thwart the treaty? And who's the mystery guest?!

Click to enlarge photos from the November 1 episode and chime in ...

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