The sizzling on-screen chemistry between Simon Cowell and Dannii Minogue kept fans of the X Factor rapt during previous seasons of the show.
And now explosive claims have emerged that the two judges enjoyed a relationship with one another shortly after Dannii joined the show in 2007.
During a series of interviews for Simon's biography, Sweet Revenge: The Intimate Life Of Simon Cowell, the mogul apparently admits to falling for his colleague’s charms.
"I had a crush on her. It was Dannii’s hair, the sexy clothes," the 52-year-old said.
"I was like a schoolboy. She was foxy. She was a real man's girl. Very feminine. It was genuine love."
The revelation comes as Dannii continues to deal with demise of her relationship with Kris Smith – with whom she has a 21-month-old son, Ethan.
Representatives for the former singer have refused to comment on the claims.
The tell-all book also reveals the true fate of his relationship with make-up artist Mezghan Hussainy, which has never ended officially.
However, Simon himself made a light-hearted reference to reports on his Twitter page, saying: "Just seen the TV ad for the unauthorised book on me. Yikes!"