Pop star Kelly Clarkson has signed on as the new face of top acne solution Proactive after using the face wash to give her a blemish-free look. Clarkson joins stars like Alicia Keys, Sean Combs and Jessica Simpson, who have all appeared in TV campaigns for the acne-clearing wash. Clarkson admits she only agreed to appear in ads after she discovered why Proactiv is America's market leader. She says, "The biggest thing with this job is it's so stressful and the thing with stress is that produces acne, especially for me. "I just break out, like, all on my chin and I already have enough people judging everything I do, I don't want them judging my skin. "When I found proactive I was like, 'Oh my gosh... This is amazing.' I just remember seeing results right away."