Keith Urban turned to social media to share a sweet anniversary sentiment with his wife, Nicole Kidman.

The country superstar posted to Instagram on Sunday (June 25), sharing a selfie of him and Kidman cuddling and smiling into the camera, looking happy and content after more than a decade of settling into domestic bliss.

"Happy Anniversary Babygirl," Urban writes to accompany the picture, adding, "Eleven years and you still feel like my girlfriend!!!"

The couple married on June 25, 2006, and have since had two children, daughters Faith Margaret and Sunday Rose. They are never shy about their ongoing love story, which appears to be one of Nashville's most storybook romances. Urban and Kidman often engage in public displays of affection, and he celebrates each anniversary with a social media post. He marked 10 years of marriage in 2006 by sharing a throwback photo of the night he first met Kidman, depicting him with a scraggly beard and his shirt open partway down his chest, while Kidman is decked out in a fringed and beaded black dress.

Urban is always candid about how much his marriage to Kidman has changed his perspective on life and love, and he wrote his current single, "The Fighter" -- which features Carrie Underwood -- inspired by something Kidman said to him early in their relationship, more than a decade ago.

“The song is about wanting to heal somebody, wanting to take care of somebody, wanting to protect somebody,” Urban tells Billboard. “It’s really like a vow in so many ways.”

Keith Urban Shares How Nicole Kidman Inspired 'The Fighter"

See Keith Urban Adoring Nicole Kidman on the Red Carpet