Will.i.am is reportedly “sick to death” of coaching a The Voice UK contestant.

The Black Eyed Peas musician serves as a panellist on the popular TV singing competition.

Apparently he is not getting along with one of his finalists, Cleo Higgins.

According to British newspaper The Mirror, Cleo has a really bad attitude behind the scenes.

The songstress got a taste of fame with her band Cleopatria in the 1990s under Madonna’s label Maverick.

Insiders on the programme tell the publication Cleo is “the worst diva we’ve had”.

The rising star is said to be completely disinterested in what seven-time Grammy Award winner Will.i.am has to say.

Will.i.am is thought to be at his wits’ end as he is “sick to death of dealing with her” and “disgusted” by her conduct.

“At one rehearsal she started screaming and shouting at Will to put his mobile down and concentrate on her,” the source said.

A spokesman for Cleo said the singer’s relationship with Will.i.am is in fact “good” and dismissed rumours of a feud.

Will.i.am was previously slammed for his addictive mobile phone behaviour.

During a 2012 live episode of The Voice UK, Will allegedly ignored producers’ instructions and snuck his phone into the studio. He was texting and tweeting during the programme and the floor manager was appalled by his “rude” and “unprofessional” decision.

Will.i.am issued an apology shortly after the controversial broadcast.

“Thank you everyone who watched #thevoiceuk tonight...if you saw me on my phone I wasn't being rude...I was connecting to people watching (sic)” he wrote on Twitter last April.