Chuck and Blair. Dan and Blair.

The show's uber-popular duos obviously involve the same woman, and have polarized respective segments of the fan base. Does Chair still stand a chance after last night's episode? What about Dair?

Yes, we know she's still engaged to Louis. But come on now.

At last week's party marking the completion of the show's milestone January episode (check out these 100th episode spoilers), Leighton Meester shared her thoughts on B's relationships with each.

Now do her co-stars feel about the characters' progression?

"I think they will always have feelings for each other in a certain capacity," Penn Badlgey says of Dan and Blair. "I can't really say where it is going to go, nor do I know...They have had plans for them since the beginning, only in the sense that they are a certain intellectual match for one another."

"I think Dan is unfortunate in the sense that he loves Blair and I think Blair is his soul mate - but he is not Blair's soul mate, because Blair and Chuck belong with each other, obviously. I think that the fans all love Chuck and Blair together, but you know, maybe you're wrong."

So is Penn upset, as Dan is, that he may not be Blair's soul mate?

"Well, that is my personal opinion, but my opinions are biased," he says. "They are an intellectual match for one another and even though it's not physical, it's this completely heady thing - which I think is fun because it's a show with heady, campy dialogue. I think they fit together well in that sense - that they don't fit together and all they do is bicker. I think that's fun for people to watch."

Ed Westwick, meanwhile, says Chuck is still "very much" in love with Blair.

The actor says he "no idea" what the future holds for Chair, but he, like many fans, personally hopes they find their way back to each other in the end. "Yeah, I like kissing Leighton," he says.

"She's so great. Leighton is gorgeous. I like working with her. She's very talented and she's fantastic to work with. Sure, why not?" As for what's coming up, he adds: "It’s difficult for me to speculate as to the opinions of fans ... but I don’t think they’re going to be disappointed, for sure."

Your thoughts? Who do you think belongs with Blair?

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