Pharrell Williams hosted an exclusive bash to launch the new season of his lines Billionaire Boys Club and Ice Cream at Harvey Nichols in London last night. Many items sold out before the event. The dress code was relaxed, with everything from jeans and tees to Chanel handbags in evidence, while many of the guests showed off pieces from previous seasons of the megastars line. London's elite were out in full force – and it’s no surprise considering N*E*R*D performed for the crowd. Mischa Barton was one of the top guests at the bash. "I really love his embroidery," she confided. "His attention to detail is just incredible."