Cee Lo Green has apologised for his foul-mouthed antics at a family-friendly music festival in Tennessee earlier this month (Jun13).

The singer performed on the bill of the Riverbend Festival in Chattanooga on 8 June (13) but risked upsetting the crowd by performing the X-rated version of his hit track F**k You instead of the cleaner rendition titled Forget You.

Organisers of the event were furious and alleged the Crazy hitmaker had agreed to sing the clean version during his set, and Green has now apologised for the disagreement and begged for forgiveness.

He tells Tmz.com, "I apologise... (It was) just a little cursing. The song is called F**k You... Forgive me Chattanooga ... have me back, okay?"