The 50-year-old country star dedicated a sweet post to the 51-year-old actress on their 12th wedding anniversary Monday.
Urban shared a throwback photo with his 1.7 million Instagram followers. The picture shows Kidman dancing as Urban plays piano.
"12 years of celestial synergized soul dancing. Happy anniversary Babygirl!!! I love you SO much," Urban captioned the post.
Kidman also marked the occasion with a video on her own account.
"Remembering 12 years ago today at a church in Manly, Australia. Still feels like it was yesterday. I'm a lucky woman. Happy Anniversary Baby," she wrote.
Urban serenaded Kidman during a concert last week in honor of the actress' 51st birthday. Kidman shared a video of the cute moment on Instagram.
"What a gift - my husband and everyone at @officialcusa Oshkosh WI singing me Happy Birthday!!!!!!" she wrote.
Kidman is parent to two daughters, 9-year-old Sunday and 7-year-old Faith, with Urban, and to 25-year-old daughter Isabella and 23-year-old son Connor with ex-husband Tom Cruise.