Fans have expressed concern after Keith Urban skipped a family holiday with his wife Nicole Kidman and their children.

The 57-year-old singer failed to appear in sweet holiday snaps posted by Nicole, 58, to Instagram on Wednesday.

Many fans have flocked to Instagram to question Keith’s whereabouts after noticing he was missing from the images.

‘Where’s Keith? Guess the rumors are true,’ one asked while another questioned: ‘Where is he?’

But Keith has been unable to holiday with his family as he is currently on tour.

The country singer is currently performing shows around Australia and is set to take the stage in Wollongong on Wednesday night before heading to Sydney.

Fans have expressed concern after Keith Urban skipped a family holiday with his wife Nicole Kidman and their children

The singer failed to appear in photos posted by Nicole to Instagram which featured sweet snaps from their European summer getaway. Pictured Nicole and daughter Sunday Rose

In the photos, Nicole gave fans a rare look at her natural locks as she posed with her daughters and sister Antonia Kidman.

The actress, 58, revealed her curly auburn locks in one picture as she embraced her daughter Sunday Rose.

She was all smiles as she showed off her natural beauty in a second image while posing with her sister Antonia.

She also flaunted her slim figure in a patterned blue crop top and a matching-coloured skirt.

It was a far cry from the dramatically straightened look Nicole unveiled at the Cannes Film Festival Presidential Dinner in May.

The Moulin Rouge! star wore the weave to add volume to her strawberry blonde locks and help give her a more youthful look.

However, the mesh wig cap was visible as Nicole posed for photos on the red carpet despite her real hair being woven into it.

She also unveiled another radical makeover at the Met Gala as she stepped out with a cropped, slicked-back cut and wavy fringe.

One photo showed Nicole flaunted her naturally curly auburn hair as she posed with her niece Lucia Hawley and her sister Antonia Kidman

The actress was all smiles as she showed off her natural beauty in another image with daughter Faith

It was a far cry from the dramatically straightened look Nicole unveiled at the Cannes Film Festival Presidential Dinner in May

She also unveiled another radical makeover at the Met Gala as she stepped out with a cropped, slicked-back cut and wavy fringe

Nicole’s habit of wearing wigs in Hollywood movies and on the red carpet has earned her a cult following over the years.

The Hollywood star has rarely showcased her natural hair in films and on the red carpet since the early days of her career, and almost always wears wigs for her roles.

Over the past few months, Nicole has stepped out in a series of dramatic wig looks – ranging from sleek, straight styles to blunt cuts, and one that became a viral misfire.

Appearing on Sunrise in May, Nicole admitted that she ‘loves changing her hair’ and uses hairpieces to achieve new looks.