Celeste Barber has documented the moment she was left red-faced after posing alongside a billboard advertising her standup show in Las Vegas. 

The Australian comedian, 42, took to Instagram Stories on Saturday night with the embarrassing clip following her Backup Dancer comedy show at The Summit Showroom at The Venetian Resort. 

The video began with Celeste standing awkwardly next to a screen flashing with her poster outside Las Vegas' Palazzo casino and hotel.

Dressed in a red bikini top, blue button-down shirt, matching shorts and sunglasses, the internet sensation began looking around to see whether anyone noticed that she was the woman in the picture.

Sadly no one seemed to care, as plenty of people were seen strolling past Celeste, unaware that she is famous. 

Eventually the screen flashed to a different poster, prompting Celeste to sheepishly walk up to the camera and sigh: 'Not my demographic.' 

Taking the cringeworthy experience in her stride, Celeste captioned the video: '2 rules of comedy: timing, reading the room.' 

It comes as Celeste continues her Backup Dancer tour of North America 

She will next travel to Denver, Colorado, to perform at the Paramount Theatre.

Backup Dancer 'promises to tackle a range of big political topics from freeing nipples and inappropriately texting therapists, to what it would be like to be Taylor Swift’s backup dancer,' according to a press release.  

'I'm excited to tell some jokes, relive some awkward memories and high kick my way across the stage with my new show,' Celeste said.

Celeste is set to take her tour to New Zealand and Australia in August, first performing at Christchurch Town Hall, Christchurch on August 2.