Grammy award winner Justin Bieber was left embarrassed after his credit card was not accepted at a Subway outlet.

The 22-year-old pop star was recognised by a fan who offered to pay for his meal at the outlet in West Hollywood on Thursday, dailmymail.co.uk reports.

According to a source, a fan of Bieber gave the bill for his impressive order of a foot-long sandwich, four bottles of milk and cookies.

Bieber had come with his girlfriend Sofia Richie, who waited in his car.

Meanwhile, Bieber is currently on a hiatus from Instagram after he shocked his fans when he decided to deactivate his account on the photo sharing platform after a public spat with his ex-girlfriend Selena Gomez.

The "As long as you love me" hitmaker opted to close down his profile when he had a feud with Selena, 23, over a comment he made about his fans being mean to the people he likes.