Justin Timberlake is a busy little boy band bee. Just in the past week he performed with Beyonce at Fashion Rocks, announced that the pair would be working in the studio together soon and showed his new 2008 Spring collection at New York Fashion Week. JT and his partner, Trace Ayala, 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.”

JT and Trace enlisted Johan and Marcella Lindeberg to collaborate on the designs this season and the A-list crowd seemed to love the end result.

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.