Ed Westwick’s hard partying is beginning to show on his waistline, and that could spell big trouble for the young actor’s contract with the CW’s cult favorite Gossip Girl, In Touch Weekly has revealed.

“Ed has been gaining a lot of weight — not just around the waist, but throughout his whole body,” an on-set source spills in the April 20 edition of the tab. “First, the costume department had to buy him new, bigger pants. Then, his shirts and jackets got way too snug. The costumers even requested that producers talk to Ed — they don’t want Chuck to be fat!”