“Thirteen years of magic, music, romance, wild adventures, and the ongoing discovery of pure love. Happy Anniversary Babygirl. xxxx – KU."
The Big Little Lies star married her hubby in a 2006 ceremony held in their home country of Australia.
The pair share two daughters together, Sunday Rose, 10, and Faith Margaret, 8.
The Oscar-winning actress also shares two children with ex-husband Tom Cruise, Isabella 26, and Connor, 24.
Back in January Nicole Kidman told PEOPLE magazine the beautiful moment she knew Keith was the man she was going to marry.
“It was my birthday, and he stood outside with gardenias at 5 a.m. on my stoop in New York,” Kidman said. “That is when I went, ‘This is the man I hope I get to marry.'”