'Hope you are not in pain': Nicole Kidman causes concern among fans with mystery injury as she's pictured publicly for the first time in weeks

Nicole Kidman appears to have injured herself while isolating at home in Nashville. 

The actress, 52, was pictured with a large walking cast over her right leg on Friday, after stepping out publicly for the first time in weeks with husband Keith Urban. 

Fans have since expressed their concern after the image, taken at Keith's drive-in concert for frontline healthcare workers in Tennessee, was shared to Instagram. 

Is everything okay? Nicole Kidman (left) was pictured by a fan with a large walking cast on her right leg on Friday ahead of husband Keith Urban's (centre) drive-in concert in Tennessee

Is everything okay? Nicole Kidman (left) was pictured by a fan with a large walking cast on her right leg on Friday ahead of husband Keith Urban's (centre) drive-in concert in Tennessee

'Hope you are not in pain. Get well Nicole,' commented one fan.

'What's happened to Nicole's foot?' questioned a second person.

'Nicole, did you hurt your foot dancing to the music? Heal quickly,' added a third admirer of the actress, as fan site Keith Urban Central shared the picture. 

Daily Mail Australia has contacted Nicole's management for comment.  

Hidden! Nicole shared her own picture from the gig to Instagram, but cropped out her foot. The actress has been self-isolating from COVID-19 at home with family in Nashville lately

Hidden! Nicole shared her own picture from the gig to Instagram, but cropped out her foot. The actress has been self-isolating from COVID-19 at home with family in Nashville lately

'Hope you are not in pain': The picture caused concern on Instagram after it was first shared by the Stardust Drive-In movie theatre, and then re-posted by many worried fans

'Hope you are not in pain': The picture caused concern on Instagram after it was first shared by the Stardust Drive-In movie theatre, and then re-posted by many worried fans

Nicole shared her own picture from the gig to Instagram, but cropped out her foot. 

In a possible attempt not to highlight the injury and overshadow Keith's incredible act for frontline workers, she was captured from behind, above the knee. 

The star wrote: '@KeithUrban just had to play!! Isolating with live music at last night’s first #UrbanUnderground drive-in gig for the incredible #frontline workers.'

Keith, 52, 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 on Friday.

Mystery! Nicole didn't have the boot when she was last seen publicly on April 18, during Keith's home performance on the One World: Together At Home live-stream benefit concert

Mystery! Nicole didn't have the boot when she was last seen publicly on April 18, during Keith's home performance on the One World: Together At Home live-stream benefit concert

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

'It's like glorified karaoke,' he told The Associated Press of the set up, that included a band member playing pre-recorded tracks and another guitar and keyboard player.

In the wake of the new coronavirus outbreak, Keith hadn't played a live show since February. He said it took him and his promoter Live Nation about a month to plan the surprise drive-in concert, as many more are planned throughout America.

'All the cars are tilted forward so they've all got a great view and you've got this freakin' killer video wall behind the stage,' said Keith.

Saying thanks!  Keith performed in front of about 125 cars on Friday during his concert for frontline healthcare workers

'It's like glorified karaoke': Keith invited 200 people from Tennessee's Vanderbilt University Health to join him for a night of music at the Stardust Drive-In movie theatre on Friday