LA Reid has revealed fellow US X Factor judge Britney Spears has been very straight-talking at auditions for the show.
Britney joined the show this year and music producer LA told Access Hollywood how impressed he had been at how quickly the Toxic singer has fitted in to her role on the show.
He said: "Anytime you do something new it takes a second to get adjusted, but she's a star. So she went into her - what I call - her star gear. She went into her star gear at a certain point and I was like, 'Oh my God. Now I get it!'
"Now I completely get why this girl is so loved. She's amazing."
He added: "Britney is tough! She's honest, she's tough, she doesn't give you fluff. She doesn't just talk for the sake of talking - she tells you exactly how she feels. She's pretty spot on - she's got good taste."
L.A. also revealed friend Mariah Carey come to him for advice before signing up to be a judge on American Idol.
He said: "We had a great conversation about it and I advised her that she should do it. I think it's great for her."