Zooey Deschanel, Joseph Gordon-Levitt Duet New Year's Song

They've known each other for 12 years and filmed two movies together, and now Zooey Deschanel and Joseph Gordon-Levitt are expressing their love of music together on YouTube.

The friends and costars did a cover of Frank Loesser's 1947 song, "What Are You Doing New Year's Eve" — with her playing the ukulele and him strumming the guitar — and posted it on her website, HelloGiggles.

Deschanel, who is up for a Golden Globe for the hit FOX show, New Girl, is as musically gifted as she is theatrical, being half of the Portland-based indie folk band, She & Him, along with M. Ward.

The Renaissance woman, who recently separated from her husband of two years, Death Cab for Cutie's Ben Gibbard, wrote some gushing words about former costar Gordon-Levitt as an addendum to their YouTube post. "We first met in the summer of 2000 while doing a tiny movie called Manic, where we bonded over a mutual appreciation for Harry Nilsson and Nina Simone and I have been lucky enough to call him one of my dearest friends ever since. When we did 500 Days of Summer 8 years later, we spent every lunch hour dancing to Marvin Gaye in the hair and make up trailer; we had loads of fun. I hope to do a thousand more movies with him because he's simply the best."

The New Girl returns from its mid-season hiatus on January 17, which is also Deschanel's 32nd birthday. Gordon-Levitt will appear in the highly anticipated conclusion to the Batman franchise, Christopher Nolan's The Dark Knight Rises, on July 20, 2012. You can catch the Golden Globes, hosted by comedian Ricky Gervais, on NBC on Sunday, January 15.

Watch Deschanel and Gordon-Levitt's duet here: