"It was actually the most fun I had had on the show in a while," Penn dished about his latest on-screen romance. "It was something new for my character, and I was having fun with the rapport, and I think my dialogue benefited from it. It was actually a lot of fun to work with Leighton. I hadn’t much. We were like the only two who had never really interacted."

Well it seems they've quickly gone from 0 to 60 in the interacting department, and Penn admitted he's not complaining. "It was great We all get along pretty impeccably, even after four years," he shared. "I mean there are ups and downs, as there are in anything. It's great. I've actually really enjoyed working with her."

With Dan and Blair busy being Dair, what does that mean for his past ladies, like Serena and Vanessa? Well, he says, you'll never believe what happens next. "I don’t know how much I can give away," he teased. "It doesn’t end the way you think it does. I can't say much."

P.S: The use of all the past-tenses are making me go uh-oh.. They'd better carry over DAir to Season 5