Angelina Jolie praised the wonderful work that her ex-husband, Billy Bob Thornton has made with his new book, 'The Billy Bob Tapes: A Cave Full of Ghosts.'

The 'Salt' star, who is now engaged with Brad Pitt, has described Thornton as someone with a 'big and beautiful heart.' In the foreword of the book, Jolie wrote that he has an incomparable sense of humour and that he can make anyone laugh until your entire face gets painful.

Jolie and Thornton separated back in March 2002 after being together for two years. His eccentricity and being a mathematician are the qualities that Jolie most like about the actor.

The actress also added that Thornton is the kind of person who cannot seem to quiet down the voices in his head. Jolie further attested that the world be dull if there will not be a person like Thornton in it.

Billy Bob Thornton, on the other hand, revealed why their marriage did not last. He said that he got scared that he was not 'good enough' for the actress. And that throughout the span of their relationship, they never came to a point of hating each other.

In the meantime, Angelina Jolie and Brad Pitt are reportedly preparing to have their engagement party in London.

Check out other stars who have released their own autobiographies in the slideshow.

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