Jennifer Hudson & Katharine McPhee's Changing Costumes on "Smash" Set

Co-star Katharine McPhee joined the 30-year-old singer donning a white top and jeans before changing into a sexy black dress.

In addition to her guest starring role on the series, Miss Hudson is also trying her hand at clothing design. The self-titled collection will be comprised of contemporary apparel and accessories for women, including a lace-embellished dress, a feminine hoodie, and a snakeskin-printed purse.

On September 6th, she'll launch her clothing line with QVC at a kickoff event for New York Fashion Week. Later, the former "American Idol" contestant will join Nicole Richie and Isaac Mizrahi on the QVC channel from 9:00 P.M. to midnight ET.