Keith Urban and Nicole Kidman at the New York premiere of 'Australia' at the Ziegfeld Theatre. New York City, USA - 24.11.08

The singer co-wrote Thank You, a song on his forthcoming album Defying Gravity, for his Hollywood superstar wife.

And Kidman was left "very touched" when she heard the beautiful lyrics her husband had written in her honour.

Urban tells USA Today, "(It) became quite a confessional - much more intimate than I might have written had I intended to write about her.

"It was very instinctual and very much from the heart. We did a quick recording of it, and I took it home and played it for her that night. I think she was very touched."

Nicole Kidman's older news:

* Kidman 'Not Pregnant'
* Kidman & Urban Offer Cash To Homeless Aussies
* Kidman Vows To Work hard On Marriage
* Kidman Shows Off Baby Photo
* Kidman To Play Transsexual Wegener Opposite Theron?

Source: WENN