Dwayne "The Rock" Johnson OK after emergency surgery

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No pain, no gain is right!

Dwayne Johnson’s rep tells E! News that the University of Miami football star turned Hollywood action hero , 40, underwent an emergency hernia operation but it’s OK, he’s fine.

“Surgery a success! Dr repaired 3 hernial tears (fun pain). Superman is on the mend,” Johnson tweeted Tuesday.

The Rock could not attend the Monday night Los Angeles premiere of his latest film, crime comedy Pain & Gain, filmed in South Florida. Director Michael Bay did the rounds on his behalf.

“Dwayne’s hurt tonight,” Bay told E! on the red carpet. “He was pushing it too hard. [He] needs to grow up and stop wrestling 300-pound men.”

Yup, Johnson’s problems began during his heated match with John Cena at Wrestlemania 29 April 7, according to Yup, he lost.

A day before the procedure, the pro wrestler/movie star Tweeted the message: “Saw my Dr who had to push my intestines back thru the tear in my abdomen. Kinda romantic. Surgery is next week. #BringItOn.”

Ouch. P&G opens Friday.