Constantine's Idol Crush!

American Idol's final countdown to the winner begins tonight!

While most of America will be watching the Top 13 sing for their lives, one former Idol, Constantine Maroulis, will only have eyes for the newbie at the judge's table: Kara DioGuardi!

"I think Kara is amazing, I've had the biggest crush on her forever," he told OK!'s Rana Meyer at a rehearsal for the Broadway opening of Rock of Ages, where he plays the lead role.

"I remember her on a show from a few seasons ago, The One, on ABC. She was the lone bright spot," he continued to gush. "She’s an incredible songwriter. She’s fronted a band, is a solo artist. And she’s beautiful."

Talk about devotion! Constantine's even come up with a plan to get Rock of Ages, a musical featuring hot hits from the eighties, right in front of his fave judge's eyes.

"Hopefully, they’ll put us on the show," he said. "They’ll do a big '80s night and have us on there and we can kick some butt."

Of course, Constantine plans to do just that when Rock of Ages opens April 7 at New York City's Brooks Atkinson Theatre.

And he wouldn't mind if a few of his fellow Idol alum are in the audience.

"Carrie Underwood is such a huge star. I’m sort of honored to have been in the running with a girl like that who has become so big," he said.

"Hopefully she comes and checks the show out. I know she loves the '80s and she sings the hell out of it."

Just like we hope all the Idols do tonight.

American Idol airs Tuesdays at 8 p.m. on Fox.