LIONEL & LUKE PUT UP DUKES!

Idol frenemies scramble to fill Katy's corner

THERE'S no harmony on the American Idol T set as Lionel Richie and Luke Bryan clash over who should replace exiting judge Katy Perry on ABC's hit singing competition, insiders tattle.

"It's turning into a real claw-fest now that Katy's leaving," a snitch tells The National ENQUIRER.

The I Kissed a Girl singer, 39, recently announced her departure from the show so she can return to her "day job" making music. Since then, Luke, 47, and Lionel, 74, have been feuding over who should fill her seat.