Hmm. Could it be that Dan and Serena aren't over after all?

Granted, Blake Lively and Penn Badgley are a (hot!) couple in real life, so perhaps this picture from the Gossip Girl set was simply taken in between takes for the show.

Another theory is that this is a head-fake from the producers, like the staged shots to make us think Blair might be kissing Nate, not Chuck, in the Season Two finale.

But we kinda doubt it. That would seem unlikely, and we all know Derena has hooked up numerous times over the course of the show's first two seasons.

Here's the hot kiss in question:

Penn. Blake. Such chemistry. Such heat.

What do you make of all this? Click to enlarge more pictures from the Gossip Girl set below (we'll add more as we get them) and tell us what you think's going on ...

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