A chorus girl in Broadway hit “Rock of Ages” has left the stage because she is three months pregnant by the show’s star, Constantine Maroulis.

Actress/dancer Angel Reed has quit the musical after becoming pregnant following a long, on-off relationship with the long-haired, former “American Idol” runner-up, The Post’s Michael Riedel reports.

Pretty brunette Reed is believed to have caught Maroulis’ eye when she wore a series of sexy outfits in her role as an ensemble cast member of the Tony-nominated show at the Brooks Atkinson Theatre.

A source told Page Six, “Angel just gave her notice last week, and told friends on the show that she is pregnant. It’s been an open secret that she and Constantine have been together for a while.”

Brooklyn-born Maroulis, 34, was a finalist on “American Idol” in 2005.

Curvy Reed, from Los Angeles, was a spokeswoman for “Get Sexy Fit” videos which show how to get in shape by lap dancing, pole dancing and doing a “strip and strut.” An online video clip shows Reed gyrating to the lyrics “Do you want a better sex life?”

Maroulis and Reed were regularly spotted out together last year, before he “dated” socialite Tinsley Mortimer, which turned out to be hype for a storyline for her CW show “High Society.”

They split early this year and Maroulis and Reed have since been repeatedly seen together as a couple, including at the Cosmetic Executive Women Beauty Awards at the Waldorf-Astoria. Maroulis and Reed, in a flowing silk dress that could hide a bump, also cuddled up for photos at the Tony Awards after-party earlier this month.

Maroulis’ manager, David Passick, said last night: “This is not something I would comment on. I haven’t spoken to him.” A rep for the show declined to comment while Reed did not respond to e-mails.