Wearing a tight mini-dress while sitting on the ground is a sure-fire recipe for fashion disaster.

And it’s something Britney Spears discovered to her cost on Sunday as she cheered on sons Jayden James and Sean Preston in a soccer match.

The 42-year-old singer arrived at the Woodland Hills, California game in a pretty white dress with intricate blue pattern, but it was so short, it barely covered her modesty.

Oops! Britney Spears accidentally flashed her underwear while manoeuvring into position while watching her sons Jayden and Sean’s soccer game in Woodland Hills

And despite holding a pale grey cardigan over her lap, the star still managed to flash her white underwear to onlookers as she perched on a picnic blanket to watch the match.

The star wore her dark hair in a loose top knot and sported heavy brown eye make-up and pale pink lipstick.

Matching diamond earrings and necklace with wedge heeled sandals completed the look as she happily sat alongside other mothers to cheer her boys on.

Oops I did it again: The singer seemed to be enjoying herself despite her accidental fashion faux pas

Awkward positioning! Britney sat on the ground in a short dress which made it awkward for her to maintain her modesty

Later, she shifted slightly sideways so her modesty was better preserved.