Mary-Kate and Ashley Olsen to publish coffee table book

They've already got their own range of clothes, fragrances, magazines, movies and posters - and now Mary-Kate and Ashley Olsen are set to become authors.

The twins, who have been on Forbes' "The Celebrity 100 list" since 2002, and in 2007, were ranked, collectively, as the eleventh-richest women in entertainment, with an estimated net worth of $100 million - are publishing a coffee table book, Influence, through Penguin Young Readers Group.

It will reportedly feature "the most interesting, challenging, creative people we know — the ones who helped pave the way for us and our generation," Ashley said in a statement.

Among them: shoe guru Christian Louboutin, actress Lauren Hutton, photographer Terry Richardson and writer Bob Colacello.

"Ashley and I interviewed the people who have inspired us, with the hope that they will inspire and teach others," Mary-Kate said.

The book — due out this fall — will also feature exclusive photos of the twins and never-before-seen interviews with the two.