Move over Chuck Bass...there's a new Upper East Side baddie in town.

When Gossip Girl returns to the CW March 8, Kevin Zegers' character, Damien, is ready to cause trouble for Jenny Humphrey (Taylor Momsen). Rumored to be Jenny's new boyfriend, Damien accompanies her to a State Dinner, but he has ulterior motives -- he needs her help with a drug exchange.

Damien puts on a good cover to maintain his UES appearance.

In an exclusive sneak preview from Monday's episode, he fools Serena (Blake Lively) into thinking someone he's not.

Running into him on the city streets, Serena is encouraged by Damien's all-American appeal.

"I thought you were going to become a Belgian prince or something after boarding school," Serena tells him. (Watch a clip above)

"Wow, you look even more fantastic than you did in school!" Damien replies in an effort to sweet-talk her. "I seem to remember some fun Spanish classes [together]."

"More like me crying over conjugations while you got straight A's and won all the athletic awards," she counters. "You had the mister perfect thing down."

Find out Damien's true backstory when the full episode of Gossip Girl airs March 8 at 9 p.m./ET.