Aaron Tveit is returning to Gossip Girl as Trip van der Bilt, Nate's politically ambitious and scandal-prone cousin. He will appear in a multi-episode arc this season, although it's not clear exactly when.

It's also unclear why he's back, but if he still has big-time political aspirations, his family's involvement with media mogul Diana Payne (Elizabeth Hurley) and Dan's tell-all book could pose problems.

Just a theory there. Or he could just be returning to woo Serena.

Trip's affair with Serena - who was termed a teenage Rielle Hunter by Lily in one of our all-time favorite Gossip Girl quotes - threatened both his political career and his marriage in Season Three.

It didn't end well for him. Nate, in one of his best moments to date, punched his cousin after Trip and Serena got into a car accident and he made it look like she was driving to avoid a scandal.

Maybe he and Nate will throw down again this season. What do you think? Are you excited for the return of Trip? What do you think brings him back to Gossip Girl in Season 5? Comment below!

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