Nicole KidmanAnd Keith UrbanThey have made it to their Sweet 16!

They shared their 16th anniversary celebrations on June 25, and also paid tribute to each other on Instagram. This photo was posted by the Oscar-winning actress at 55. The couple, who share daughters Sunday Rose, 13, and Faith Margaret, 11, married in Sydney, Australia in 2006.

“Sweet XVI,” Nicole wrote. Remember this as if it were yesterday. Forever.”

Keith took a picture of himself and his wife at a restaurant. Keith wrote “HAPPY SEET 16 BABYXxxxx.”

The two of them have been friends for many years and often support each other at celebrity events. They often attend premieres or award shows together. The actress and singer celebrated their anniversary a month after Nicole made a surprise appearance onstage at Keith’s concert at the Colosseum in Caesars Palace in Las Vegas.

“What is your real name?” Keith joked with her. Keith asked her jokingly, “Where are your roots?”

The actress sweetly replied, “Nicole Urban.”