Dennis Quaid as Bill Clinton in The Secret Relationship on HBO
Exclusive: We don't expect McDonald's to be lovin' the secrets of Dennis Quaid's diet.

Quaid went to great lengths to play Bill Clinton in HBO's upcoming 'The Special Relationship.' "I gained 35 pounds for the role," he tells PopEater. "I could have worn a suit to enhance my weight, but I didn't want to go that route. I did it the way he did: I went to McDonald's every day."

Did he enjoy the license to super size it? "Well, it's different when you're doing it for work. You feel like a baby on a feeding schedule," says Quaid, whose performance as Clinton is outstanding.