Who’s the former “American Idol” star wearing a wedding gown? Why it’s none other than Katharine McPhee, starring in the romantic comedy ‘You May Not Kiss the Bride,’ and ET is with her on the set!

Due out next year, the film is currently lensing in breathtaking Hawaii, and Katharine tells ET, “We’re having so much fun, we can’t even believe we’re here working.”

In the movie, Katharine plays the daughter of a Croatian mobster (’Borat’ star Ken Davitian) who tries to obtain U.S. citizenship by setting her up with an American photographer (Dave Annable of ‘Brothers & Sisters’). Of course, the pair begin to fall in love, much to the chagrin of her father. Mena Suvari and Vinnie Jones also star in the comedy, written and directed by Rob Hedden. The film is produced by Hawaii Film Partners.

Married for one year to hubby Nick Cokas in real life, Katharine also starred opposite Anna Faris and Rumer Willis in ‘The House Bunny,’ and we asked her if she’s leaving music behind for a permanent movie career.

“I love both worlds, and I tend to just kind of keep focused on the present,” replies the 25-year-old star, who has a new album in the works. “I’m busy on both, but I’m definitely happy to be here right here at this moment.”