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Mary-Kate and Ashley Olsen, Hollywood's most famous young twins, are launching their own style bible. The fashion book called Influence which is fitting seeing how heavily they have been able to impact the wardrobes of millions of young girls worldwide.

The Penguin-published book will be released in the fall when it's sure to win over the hearts of fashionistas, young and older. It will feature photos of the girls in some of their most stylish pieces, both in their everyday lives and on the red carpet. According to Penguin, there will also be exclusive material never seen anywhere before, including interviews and photos.

"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," Ashley Olsen said.

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

The 21-year-old style icon duo have created several fashion lines together including The Row and the Elizabeth & James Collection as well as a younger tween line sold at Wal-Mart.