American Idol runner-up Katharine McPhee is engaged to actor Nick Cokas, sources tell PEOPLE. McPhee, 23, recently has been showing off a ring from Cokas, 42. They have been dating for more than a year. "Katharine is bubbling over with excitement for her upcoming wedding," a source says. "
She is all smiles when she talks about the planning. It sounds like everything is going very smoothly." The couple met in 2005 when they performed in a Los Angeles theater production of The Ghost and Mrs. Muir. Their union began as a friendship, McPhee told PEOPLE last year. "He took me up to my San Francisco (Idol) audition," McPhee said. That's when their relationship blossomed. "We totally fell in love," she said.