Actress Nicole Kidman celebrated her wedding anniversary to country singer Keith Urban with a romantic photo of the couple on Instagram on June 25.

In the photo, the 57-year-old star relaxes by the sea while her husband plays the guitar. Nicole wears a summer dress that shows off her long legs while the 56-year-old singer wears an unbuttoned shirt.

“Forever,” Nicole Kidman captioned the post, adding the hashtag “happy.”

Kidman’s close friend, actress Naomi Watts, commented: “This is true love. It’s amazing!” Singer Rita Wilson, wife of actor Tom Hanks, commented: “Love you both. Happy anniversary to you loves.”

Nicole Kidman and Keith Urban married in 2006 in Sydney. The Australian couple have two daughters, Sunday Rose, 15, and Faith, 13.

Keith Urban recently revealed that if it weren’t for Nicole Kidman’s strong love, he wouldn’t be where he is today. “Just four months after we got married, my addictions almost broke our marriage. I had to go to rehab for three months without knowing what would happen to us. But Nicole overcame all the negativity, chose love. And here we are 18 years later. Her love is like no other I’ve ever met,” Keith honored Nicole Kidman at the American Film Institute’s Lifetime Achievement Awards on April 26.

Nicole Kidman was moved to tears when she heard her husband’s words . In her acceptance speech, the Aquaman actress thanked her husband, two daughters and family. She said that the greatest luck in her life is having the people she loves by her side. “They are all the great loves of my life,” she said.