A book-signing for fans of twin actresses MARY-KATE and ASHLEY OLSEN took an ugly turn when they were bombarded by a legion of angry protestors wearing mocking masks of the pair.

Fans lined up to meet the 22-year-old moguls, who were celebrating the release of their new coffee table book, Influence, on Tuesday.

But the pair were stunned to find animal rights activists shouting outside the event - part of a campaign launched by People for the Ethical Treatment of Animals (PETA) against the stars for their fashion choices.

A PETA spokesperson tells AhlanLive.com: "People who still wear fur haven't woken up to the fact that a big, dead animal on your back makes you look like a troll.

"Compassionate fashionistas know that real beauty comes from the heart - something that the Trollsen Twins seem to lack, considering all the animals they've killed for their clothes."