LENO STILL A NO-NO FOR BITTER O'BRIEN!

Grinding grudge a dozen years after late-night dust-up

CHEESED-OFF Conan O’Brien is STILL carrying a bitter grudge against former late-night rival Jay Leno!

Sources say the short-lived Tonight Show host continues to seethe because he believes Jay ruined his late-night career by reneging on his word and returning to take the show back after handing him the reins.

“It still sticks in Conan’s craw to this day!” a friend tells The National ENQUIRER.