Washington, June 27 : Keith Urban recently dedicated the song ' Once in a Lifetime ' to wife Nicole Kidman on their anniversary while performing on stage in Melbourne.

The 'You'll Think of Me' singer revealed that the song was about his relationship with the 47-year-old actress, Contactmusic reported.

The 46-year-old star said that a couple months before their wedding, they were talking about the future that made Kidman very nervous but he promised to be her man "forever" and that moment inspired this track.

Urban and Kidman had been married for eight years now. (ANI)