Prosecutors have charged Cee Lo Green with illegally giving a woman ecstasy while at a dinner in Los Angeles last year.
The Los Angeles County District Attorney's office charged the singer, whose real name is Thomas DeCarlo Callaway, on Monday.
Green, 39, is charged with one felony count of furnishing a controlled substance. If convicted he faces four years in state prison.
Authorities said Green and a 33-year-old woman were dining at a downtown Los Angeles restaurant sometime between July 13 and July 14, 2012. The two later went back to the woman’s hotel, according to the district attorney’s office.
Green spoke only once during a brief arraignment hearing Monday to acknowledge he understood the court's scheduling of his case.
He sat in a front row of the courtroom with his girlfriend while waiting for a bondsman to post his $30,000 bail. His case is due back in court on Nov. 20.
Prosecutors say they declined to file a rape charge against the singer.
Green was pleased that the rape charge was rejected and will address the ecstasy count in court, his attorney Blair Berk wrote in a statement.
She said any sexual contact between her client and the woman was consensual.
"Mr. Green encouraged a full and complete investigation of those claims and he was confident once conducted he would be cleared of having any wrongful intent," Berk wrote. She declined further comment.
Green is the Grammy winning singer of the hit "Forget You" and performed as part of the duo Gnarls Barkley. He appears as a judge on NBC's "The Voice" competition show.