Justin Timberlake has already conquered music, acting, design — and now he can add New York Fashion Week to his stellar resume. Along with business partner Trace Ayala, the superstar showed the William Rast Spring 2009 collection to a star-studded audience at Roseland Ballroom on Sunday night. Timberlake tells PEOPLE that just the fact that it’s a spring show was more intimidating than showing in N.Y.C. “I would just like to say first of all it’s so hard to put spring fashion shows together. With fall, you can layer everything up.” Ayala adds, “You have to focus on two or three pieces, tops.” Luckily, Timberlake and Ayala had some help — the team collaborated with Johan and Marcella Lindeberg on the designs this season. Timberlake explains, “I was a huge fan of his and I just thought it would be a cool thing if he did something less refined. A little more rugged….Johan loves the rock ‘n’ roll lifestyle.” And the crowd — which included Kevin Connolly, Jeremy Piven, Malin Ackerman, Emmanuelle Chriqui and Carla Gugino — definitely approved of the Blackberry Bold-sponsored show, which racheted up the fashion elements of the denim line significantly. Rachel Hunter enthused afterwards to PEOPLE, “I thought it was great. It was cool. I loved the jackets and the fringe. It was a very cool mixture. I think they put a really good look across.” Click here to see all of PEOPLE.com’s N.Y.C. Fashion Week coverage.