Don Draper may be relaxing poolside as “Mad Men” gets set to return next month, but star Jon Hamm is not relaxed at all — and it’s a very “big” deal

“They’re called private parts for a reason. I’m wearing pants, for f–k’s sake. Lay off!” Hamm, 42, tells Rolling Stone magazine about bloggers who speculate on the size of his package.

“When people feel the freedom to create Tumblr accounts about my [penis], I feel like that wasn’t part of the deal.

“Whatever. I guess it’s better than being called out for the opposite.”