Pharrell Williams is reportedly the frontrunner to join American Idol due to his close relationships with others on the show.

The rapper was recently linked to the job, following the departures of Jennifer Lopez and Steven Tyler. Mariah Carey has already signed on as a judge, but the other spot is still vacant. Pharrell looks likely to join the superstar singer and fellow panellist Randy Jackson.

“Williams will join Mariah Carey as one of the new judges and his relationship with the five-time Grammy Award winner and Idol stalwart Randy Jackson was a factor in his decision. Williams is super tight with Mariah and Randy, says our source,” reports New York Daily News.

Over the weekend it was reported that Pharrell’s contract negotiations had been going well. It’s thought he will be unveiled as a new judge sooner rather than later.

“We’re told that he’s informed his closest associates that he’ll be at Idol auditions later this month,” the publication added.

Nick Jonas has confirmed he’s in the running for a spot on the panel, with P. Diddy also thought to be in talks.

There is speculation the show might be looking for two more judges, with Randy possibly moving to a mentoring role.