Katharine McPhee was on the The Tonight Show with Jay Leno last week.

She performed “Love Story," the latest single from her debut album. Check it out below:

[youtube]http://www.youtube.com/watch?v=P65XPcvGkvc&eurl=http%3A%2F%2Fjustjared%2Ebuzznet%2Ecom%2F[/youtube]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.