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24 December 2011, 09:00 | Updated: 24 December 2011, 10:18
The rapper tells capitalfm.com that he refers to The X Factor mogul as Uncle Si.
Labrinth has said Simon Cowell is like a family member to him.
The X Factor boss signed the 'Earthquake' rapper to his record label Syco last year, making him the first non-X Factor star on the roster.
Speaking to Capital FM, Labrinth said he is so close to Simon that he calls him Uncle Si.
"He's like a family member he's so cool man," he said. "He's a really nice guy. I think he just puts on this little façade but he's a cool dude.”
A host of other artists have been linked to the record, although they have yet to be confirmed.