The 36-year-old producer admits he snubbed the 'Bad Boys' hitmaker - who shot to fame after winning 'The X Factor' in 2008 - after she chased him around a dressing room asking for a duet.
Speaking to Hits Radio presenter Darryl Morris, he said: ''One of the massive 'X Factor' people was chasing me around these dressing rooms.
''[She was] leaving notes for me everywhere saying they wanted to work with me and then kind of got up in my face and gave me their phone number and was like, 'make sure you call me, make sure you call me' and I was already thinking, that you're a good singer and stuff, but you just wouldn't fit on my music and I already knew that I wasn't going to be calling her.
''It was really awkward... She's very sweet and it's just awkward because you can't really explain it to somebody. You don't want to be offensive but it's kind of like you just wouldn't fit on what I do.''
Meanwhile, the 'Dibby Dibby Sound' hitmaker recently announced Ellie Goulding would be featuring on his new single 'Flashlight' later in the year.