Nicki Minaj is set to quit American Idol after one season. The "Moment For Life" singer has reportedly decided not to return to the reality show's judging panel because she wants to focus on her own music career.

"It's safe to say she isn't coming back to Idol. She's okay with it. She had a great time but was only going to do one season anyway," a source said.

The 30-year-old rapper joined the show alongside fellow new judges Keith Urban and Mariah Carey, and veteran judge Randy Jackson, who recently confirmed he is leaving the show. It was previously revealed that producers want to see the show return to a three-judge format next season for the first time in five years in a bid to combat the show's declining ratings.

Kevin Reilly, Fox's entertainment chairman, also revealed all of the judges, including Nicki, had been invited back. Speculation was rife as to whether Mariah and Nicki would return for a second season after a series of explosive public rows. Mariah was said to be planning to quit because of their vicious spats.