galleryKate Middleton in Issa Dresses08.12.11galleryKate Middleton in Issa DressesKate Middleton’s favorite label has just been bought by 26-year-old Camilla Al-Fayed. By Isabel Wilkinson.08.12.11 4:00 AM ETRex; Rex; AP; RexKate Middleton has been called the unofficial brand ambassador of British fashion label Issa. Now the company has been bought by Camilla Al-Fayed, the 26-year-old half-sister of Princess Diana’s late boyfriend, Dodi Al-Fayed. By Isabel Wilkinson. David Rose, Pool / Getty ImagesThe Duchess of Cambridge donned a purple Issa jersey dress to attend the Canada Day celebrations in Ottawa on July 1. Sang Tan / AP PhotoTo officially announce her engagement to Prince William in November 2010, Middleton wore a midnight-blue Issa wrap dress—which perfectly matched her sapphire engagement ring. The frock sold out in 24 hours and sparked a craze of “little blue dresses.” Mark Stewart, Camera Press / Rex USAAt the wedding of their friends Harry Meade and Rosie Bradford last October, Middleton wore a blue Issa dress with a fascinator hat. Steve Allen / Rex USAOn a shopping trip on King’s Road in London in April, Middleton wore a simple black wrap dress by Issa. Rex USAOn the way to the office in August 2007, Middleton wore a printed wrap dress by the designer. Rotello, MCP / Rex USAMiddleton partied at the London nightclub Boujis in a printed Issa dress in August 2007. Alan Davidson / Rex USAKate swanned in a gray Issa dress with a plunging neckline at a gala for the Starlight Children’s Foundation at the Saatchi Gallery in London in September 2009. Alan Davidson, O'Neill / Rex USATo attend the Boodles Boxing Ball in June 2008, Middleton wore a slinky pink dress by Issa, which she paired with a black clutch.