New Jersey Gov. Chris Christie secretly underwent lap-band stomach surgery to aggressively slim down for the sake of his wife and kids, he revealed to The Post last night.

The Garden State governor agreed to the operation at the urging of family and friends after turning 50 last September.

He told The Post he was thinking of his four kids and how it was time to start improving his health when he decided to have the procedure.

“I’ve struggled with this issue for 20 years,” he said. “For me, this is about turning 50 and looking at my children and wanting to be there for them.”

He also insisted that, contrary to what observers may say, the effort to slim down was not motivated by thoughts of a presidential bid.

“It’s so much more important than that,” he said.

New Jersey Gov. Christie has stomach surgery as part of weight-loss plan – NYPOST.com