Katharine Hope McPhee (born March 25, 1984) is an American pop singer, songwriter, and actress. She gained fame as a contestant on the fifth season of the Fox reality show American Idol in 2006, eventually finishing as the runner-up.

Her self-titled 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 number 27 on the Billboard 200. The album featured the single "Had It All", which peaked at number 22 on the Billboard AC chart. It has sold 45,000 copies as of January 2011. Her third album, the holiday-themed Christmas Is the Time to Say I Love You, was released on October 12, 2010. The album debuted at number eleven on the Billboard Top Holiday Albums chart while the single "Have Yourself a Merry Little Christmas" peaked at number sixteen on the Billboard AC chart. As of January 2011, this album has sold 23,000 copies. Her latest album is expected to be released in early 2014 under Columbia Records.