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Add author to Mary-Kate and Ashley Olsen’s ever-growing resume.

The 21-year-old twins, who topped last year’s Forbes Top Earning Stars Under 21 list with an estimated fortune of $40 million each, are publishing a coffee table book titled Influence, through Penguin Young Readers Group.

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

I thought the always caffeinated twins would come out with their own coffee before a coffee table book.  I love artistic coffee table books, so I think I will have to check it out in the fall.