Keith Urban gushed that marrying Nicole Kidman is his biggest accomplishment.

The four-time Grammy award winner and Kidman tied the knot in June 2006.

Urban expressed that marrying the right person for the right reasons is a huge feat.

The couple have been married for 15 years and parent 13-year-old Sunday and 10-year-old Faith.

Urban praised Kidman for helping him with his longtime sobriety.

The songwriter called the "Aquaman" actress, the one who positively changed everything in him.

Urban said the Oscar winner was everything he wanted and beyond that.

On October 16, Kidman gave a heartwarming Instagram tribute to her husband for his 54th birthday.

The actress wished her "love" the happiest of birthdays and shared an intimate photo of them.