'Uptown Funk' star Mark will apparently be helping Radio 1 DJ Nick when the judge has to whittle his boys category down ahead of the live shows.
A source told The Sun: "Mark is an absolutely massive name in the music world. He was already big but 'Uptown Funk' took him to a new level. Mark is one of his mates and was very happy to help him out. And if there's one thing he's got in abundance, it's credibility."
Grimmy has, in recent weeks, received some criticism from viewers on the show, but show boss and head judge Simon Cowell has insisted Nick has nothing to worry about.
He told the Daily Mirror: "I think [Nick] is doing good. He is tough and he gets it. Is he being sidelined for Louis Walsh? No chance. Forget it. He is 100 percent safe."
Grimmy is set to film his Judges' Houses in a fortnight, and despite the other judges holding the next round in exotic locations, Nick is set to be hold his in Oldham, Manchester.
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