Reuters reports that in a statement, the twins' publisher, Penguin, said the book would include: "exclusive photographs of Ashley and Mary-Kate from world renowned photographer Rankin, and a wide variety of other never-before-seen materials and interviews from Mary-Kate and Ashley's personal collections."

The book, which is due out in the autumn, will feature the siblings' writings on artists and designers such as Jack Pierson, Terry Richardson and Bob Colacello.

In a statement, Ashley Olsen said: "Mary-Kate and I have filled 'Influence' with the most interesting, challenging, creative people we know - the ones who helped pave the way for us and our generation."

Her sister said: "Ashley and I interviewed the people who have inspired us, with the hope that they will inspire and teach others."