American Idol graduate Katharine McPhee, who is gearing up for the release of her self-titled debut album Jan. 30, will guest star on pop culture video blog Lonelygirl15.

The blog is a video serial centering on the life of a fictional teenage girl named Bree. In an episode that begins airing Jan. 19, the RCA Records artist will play "a girl," according to an RCA spokesperson."

The album's lead single, "Over It," may also be heard in the Lonelygirl15 episode starring McPhee.