Keith Urban reveals Nicole Kidman has broken her ankle after she was spotted in a moon boot

Nicole Kidman has broken her ankle while isolating in Nashville with her husband Keith Urban.

The Australian actress' injury was revealed after she was photographed by a fan wearing a moon boot as she stepped out publicly for the first time in months over the weekend.

The photo of Kidman - wearing skinny jeans with one black runner and the grey moon boot - was taken at Urban's drive-in concert for frontline healthcare workers in Tennessee.

As fans expressed their concern after the image was shared to social media, the country singer spoke out about his wife's injury.

"She broke her ankle, but she's a trooper," he told ET.

"There she was last night among all of the folks, hobbling around on her boot with her mask on."

Urban did not reveal exactly how the accident occurred.

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The 52-year-old's concert is thought to be the first major live music show of its kind in the US since coronavirus shutdowns cancelled hundreds of concerts and tours and closed large venues in March.

Urban invited around 200 people from Tennessee's Vanderbilt University Health to join him for a night of music at the Stardust Drive-In movie theatre.

He played on a flatbed truck in front of about 125 cars with two other musicians.

He now plans to stage more drive-in concerts around America.