Pop star Justin Timberlake turned fashion designer last night (17OCT06) at the runway debut of his William Rast clothing line at Los Angeles Fashion Week. The SEXYBACK star decided to show his collection at one of Hollywood's hottest nightspots instead of the official fashion week site at Smashbox Studios in Culver City. A catwalk and scores of bleacher seats were added to a section of nightclub Social Hollywood for the show. Another part of the massive club was reserved for the exclusive after-party where the 25-year-old Grammy Award winner performed for the crowd. The star-studded guest list included Wilmer Valderrama, Eve and Timberlake's girlfriend Cameron Diaz, who gave interviews and posed for pictures before taking a seat in the front row. Other VIP attendees included PARIS and Nicky Hilton, Maroon 5 frontman Adam Levine and GREY'S ANATOMY star Patrick Dempsey. Timberlake developed the "Street Sexy" collection with his childhood friend TRACE AYALA last year (05). The star reportedly spent months picking the fashion show's playlist, which included David Bowie's REBEL REBEL, Nine Inch Nails, NERD, Prince and JAY-Z. The William Rast clothing line is named after Timberlake and Ayala's grandfathers, who were major influences on their lives.