Katharine McPhee certainly knows how to rekindle the McPheever that infected everyone during her 'American Idol' days. The starlet already unveiled her new blond 'do to PopEater a few months ago, and now she's showing off more -- as you'll see in her performance on 'The Tonight Show.' The formerly brunette songstress flaunted more than her voice to Conan O'Brien thanks to a remarkably revealing top. See For Yourself: