David X Prutting/Sipa Press

The designing sisters gave a double dose of fashion at the launch party for their debut book Influence at Barneys in New York. Mary-Kate put her eclectic stamp on a Givenchy dress by adding a tasseled vintage shawl from Southpaw along with Balenciaga heels and Fred Leighton jewels. Ashley showed off her polished style in a vintage David Fielden dress and added sleek accessories including Manolo Blahnik heels and Fred Leighton jewelry.
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Mary-Kate and Ashley Olsen