SIMON Cowell’s fiancee Mezhgan Hussainy has moved out of his Beverly Hills mansion amid rumours their relationship is cooling. The make-up artist is now living in Cowell’s hillside retreat – where his ex Terri Seymour stayed after splitting from the X Factor judge in 2008. Cowell’s pals jokily nicknamed the £3.5million house in the Hollywood Hills “the girlfriend graveyard”. A worker at the house said: “Yes, Mezhgan is living here. She is here now.” She refused to confirm if the pair had broken up but one insider said: “It looks like history is repeating itself. “When Simon split with Terri, she moved to the hillside house for about 18 months before moving to a pad which Simon is supposed to have paid for. “Some people have joked that the other house is his girlfriend graveyard – it’s almost as though the girls get sent there when the relationship has died.” Neighbours said they have not seen the music mogul – who used to date 1980s singer Sinitta – recently, and believe the Afghan-born beauty is living alone. And Simon’s mum, Julie, says she has not heard from Mezhgan for “weeks”, although the pair used to speak regularly. Rumours that the couple have split after an 18-month engagement went into overdrive this week after Simon told a US radio station he was “not sure” whether they were an item. Simon, 51, said last year he would like children with Mezhgan saying he was “smitten” and was looking forward to having “little Simons around”. But in a recent interview with American GQ magazine, he appeared to change heart, saying: “Truthfully, with the schedule, the crazy hours, I don’t think it would work.” And the 51-year-old has been lavishing praise on his American X Factor co-star Paula Abdul. He said: “There is something about her. I find her fascinating.” Reports in the US claim the pair spend hours on the phone.