Stars of the stage-to-screen adaptation of the musical Rock of Ages have been revealing where they have tattoos.

Pointing to the initial Z on her wrist, actress Malin Akerman explained: "This is how committed I am to my husband. That is the first initial of his last name. Didn't go first initial of first name. But, you know, I just keep telling him if he misbehaves, it's for Zorro. So, he better behave."

"I do have a tattoo," said Diego Boneta, who plays Julianne Hough's love interest in the film.

"You do??!!" asked Hough, before her co-star answered: "Of course I don't!"

"I know, because I know everything about you. He strips for me," she then joked.

Actress Catherine Zeta-Jones plays a politician's wife in the film and, like her character, wouldn't consider a tattoo.

"Because I don't want to be 90-years old - well I do want to be 90 years old - I actually want to be 190 years old, but I don't want to have a saggy tattoo. I don't mind anything else being saggy, but not a tattoo. Because it'll get warped, and maybe it'll spell something completely different."