Nicole Richie Nicole Richie

Nicole Richie and designer John Varvatos have signed on as celebrity mentors on NBC's new reality series, Fashion Star, the network announced Thursday. They join fellow mentor Jessica Simpson and host Elle Macpherson.

"NBC could not have asked for better additions to the celebrity mentors than John Varvatos, one of the most well-known menswear designers in the nation and international style icon and creative director, Nicole Richie," Paul Telegdy, NBCS' executive vice president of alternative programming, said in a statement. "Both are trendsetters and tastemakers and their design skills and expertise will be invaluable to our contestants on the series."

Jessica Simpson is NBC's Fashion Star

Fashion Star features 14 designers trying to create the next big brand in fashion and will actually allow viewers to purchase the winning designs each week. The winning designer will receive a multi-million dollar grand prize to help launch their clothing line in three of America's largest retailers.

A premiere date for Fashion Star has yet to be announced.