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.

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.”

Case in point: the two will join forces on an upcoming independent film titled The Last Caller. McPhee will star in the dark romantic comedy and Cokas will produce.

McPhee, whose debut CD came out earlier this year, is currently filming the Anna Faris comedy I Know What Boys Like.

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According to OK Magazine, American Idol runner-up Katharine McPhee has gotten engaged to her longtime boyfriend Nick Cokas, 42.

Her longtime boyfriend, Nick Cokas, proposed to the 23-year-old recently, but friends insist it wasn’t a big surprise. An insider tells American magazine OK!, “They’ve been talking about it (marriage) for some time.”

Best of luck to Katharine and Nick! I’ll be waiting impatiently for I Know What Boys Like and her new album–which according to her is going to be John Mayer-esque.

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Here she is at the Third Annual Walker Pink Party in Santa Monica, September 8.