Haylie Duff and Hilary Duff at the Nickelodeon Kid's Choice Awards held at Pauley Pavillion, UCLA. Los Angeles, California - 01.04.06

The company have re-named their $196 (£109) peg-leg blue jeans the "Duff Jeans" after the stylish sisters.

Hilary claims, "Blue Cult named the skinny-leg jeans after us, because that is our favourite style."

The jeans, which reportedly have a special "butt-boosting" effect, are flying off shop shelves and other Hollywood celebrities, including COURTENEY COX, have been spotted wearing the popular style.