Katharine McPhee engaged

American Idol runner-up Katharine McPhee is engaged to actor Nick Cokas. McPhee, 23, has recently 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," says a source. "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 an LA theater production of The Ghost and Mrs. Muir. Their union began as a friendship, McPhee said last year: "He took me up to my San Francisco audition. We totally fell in love." As for the 19-year age difference, McPhee says that "was never really a concern." The two connect because "he just makes things really fun" and "we love business. We love going to meetings together and create things together." McPhee's rep has not commented on the engagement.