The 36-year-old actress, who divorced Thornton almost ten years ago, has penned a foreward for his new book, 'The Billy Bob Tapes: A Cave Full of Ghosts'.
"He (Billy) has an unmatchable wit and can make you laugh until your face hurts. To be with him is like being with a mad mathematician. He is constantly counting and repeating.
"Some people walk through life able to quiet the voices in their heads. He can't. And I, and everyone else who knows him well, we love him for it. I know one thing: The world would certainly be a hell of a lot more dull if that man weren't in it," she said.