It's not as pressing an issue for Gossip Girl fans as the question of what will happen between Dan and Blair when the show returns on April 18.

But it's still worth pondering: Why will director David O. Russell make a cameo before the season is over? The man behind The Fighter will portray himself later this spring, as he's already shot a scene with Blake Lively in... Santa Monica?!?

What brings Serena to California?

With a couple weeks remaining until new episodes air, sounds like a storyline to debate in our Gossip Girl forum. Let the theories fly!