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!"
The supremo apparently called off his engagement to the striking brunette after work commitments and lingering friendships with his former girlfriends put a strain on their union.
He now plans to gift Mezghan his sprawling £5 million Beverly Hills mansion in a bid make amends for their failed romance.