CeeLo Green -- Dropped From Headlining Gig After Ecstasy Plea Deal

A Louisiana music festival says CeeLo Green no longer fits the concert's "wholesome family environment" ... so he's been axed from headlining the event.

Organizers for the Gretna Heritage Festival released a statement saying Joan Jett and the Blackhearts will replace him in Sunday night's lineup. There was no further explanation about why CeeLo was dropped.

TMZ broke the story ... the singer plead no contest last week to sharing ecstasy with a woman who had accused him of slipping something n her drink. The plea deal allows CeeLo to maintain his innocence.

The Freedom Live gig, set for Washington, D.C. later this month, also cut CeeLo -- but said it was because of a weird set of tweets from his account following the plea deal. The messages implied a woman has to remember being raped in order for it to have occurred.