The `Don`t Hold Your Breath` singer - who worked with Simon on the UK version of `The X Factor` as a guest judge and is hotly tipped for a role on the US form of the show - enjoys a great relationship with the music mogul and particularly enjoys watching him have his make-up put on.
She said: "I have a great relationship with him, we have a blast. I have so much fun teasing Simon we hang out.
"He has what I call a `powder face`. Whenever the make-up artist puts a light coat of powder over his face he leans back, closes his eyes and relaxes like he is meditating. He`s very peaceful."
The 32-year-old beauty is currently dating British Formula 1 driver Lewis Hamilton, and when the pair enjoy some time together they love eating and "get crazy" having a games evening.
She told the Daily Mirror newspaper: "I don`t have much down time but when I do I love to cook for him. I make this dish my family in Hawaii make, oyster chicken - it`s been in the family for years.
"It`s chicken, lots of vegetables and rice, so it`s really healthy. If I wanna get crazy I`ll have game night. We play `Cranium`, `Taboo` or cards. I can kick a*s but Lewis is pretty good at cards - although he`s pretty good at everything."