Katharine Hope McPhee Foster (born March 25, 1984) is an American pop singer, songwriter and actress. She gained fame as the runner-up on the fifth season of American Idol in May 2006.

Her eponymous debut album was released on RCA Records on January 30, 2007, and debuted at number two on the Billboard 200, selling 381,000 copies (as of December 2010). The album's first single, "Over It", was a Pop Top 30 hit and was certified gold in 2008. Her second album, Unbroken, was released on Verve Forecast Records on January 5, 2010, and debuted at No. 27 on the "Billboard 200". The album featured the single "Had It All", which peaked at number 22 on the AC chart.