They join previously announced celebrity mentor Jessica Simpson and host Elle Macpherson, Paul Telegdy, executive vice president of alternative programming at NBC and Universal Media Studios, announced Thursday.
"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," Telegdy said in a statement. "Both are trendsetters and taste-makers and their design skills and expertise will be invaluable to our contestants on the series."
"Jessica, Nicole, John and Elle make the most exciting team we have ever worked with on a reality television show and we are thrilled to feature such an extraordinary group of mentors and designers," added Ben Silverman, executive producer of "Fashion Star" and chief executive officer and founder of the multimedia studio Electus.
Celebrity Families of 2014 [PHOTOS]