Nicole Kidman and Keith Urban are both masters of their craft — her at acting and him at singing. And having been married for 19 years, the two have figured out how to make things work. In an interview with W Magazine published on Friday, January 3, Kidman, 57, shared the secret that has allowed her marriage to Urban, also 57, thrive.

The Golden Globe winner married the country singer in June 2006. The couple are the parents of daughters Sunday, 16, and Faith, 13.

Maintaining a relationship for 18 years cannot be easy. Nicole Kidman also has the difficulty of having a very tight schedule due to the length of her filming. Even so, the Hollywo