Kate Winslet's novel approach

The Titanic star's debut book, The Golden Hat, features self-taken photographs of celebrities — including George Clooney, Leonardo Di Caprio and Penelope Cruz — wearing her favourite trilby hat to raise awareness of autism.

The book was inspired by Winslet's experience working on the 2009 documentary, A Mother's Courage, about a young boy, Keli Dagmar, who has a severe form of non-verbal autism. The name of the book, which was published last week, was taken from a poem by Keli.

"In the poem, a magical golden hat enables him to speak when he wears it," Winslet, 36, explained.

Alongside the self-portraits are the stars' responses to the question: "If you couldn't speak but this hat enabled you to do so, what would you like to say?"

Angelina Jolie, whose famous pout is the only part of her face visible beneath the trilby, says her first words would be: "Eat vegetables." Clooney captions his picture "I'm sorry about Batman And Robin" — a reference to his 1997 film that was voted the worst-ever by Empire magazine.