The country crooner recently celebrated their wedding anniversary with a mushy Instagram post that read, "Happy Anniversary Babygirl. Eleven years and you still feel like my girlfriend!!!"
A post shared by Keith Urban (@keithurban) on
The two, who wed in 2006 and have two daughters, Sunday Rose (8) and Faith Margaret (6), are well known for showing PDAINIY (public displays of affection) on the red carpet.
However their marriage hasn't been without issues as Keith has long battled with booze and drug addictions.
In an interview last year with news.com.au, Nicole opened up about the secret to their marriage, saying they've lasted due to an "absolute commitment and kindness" and the "desire to protect and help each other" concluding with "that's what our relationship is."
"Keith and I always say that we are just so lucky to have each other."
In an interview with Hits magazine, Keith revealed that his marriage has been a "learning curve" for him, especially in times of conflict when he admits he'd "get defensive and go tearing out the driveway at 90 miles an hour. That’s when it gets pear-shaped. What she needs is for me to stay, to be close, to hear her."
He also revealed that the communication between the pair has strengthened over time, as Nicole "doesn't keep things in or bottle them up. If I'm a better man, it's because of her."