Oh dear. Pharrell Williams and Will.i.am aren't getting along.

When he's not busy being a coach on The Voice UK, Will.i.am is filing lawsuits against people and this time, it's Pharrell. Will.i.am is claiming that Pharrell's 'i.am+' brand is too similar to his own.

According to the lawsuit, Pharrell has been busy trying to trademark any number of terms and names, one of them - and this is really weird - is Pink Slime. Yeah, that's right. It's that pinky goo stuff that Mattel make. How could he possibly want that as a trademark? Is it for a song, maybe? Who knows.

Will.i.am had denied reports in the past that he was going to sue Pharrell, claiming that he had "done what any trademark owner must do to do protect and matain a trademark". Pharrell is in the middle of other legal woes with the estate of Marvin Gaye suing him and Robin Thicke over the similarity between their 'Blurred Lines' and Gaye's 'Got To Give It Up'.