The 22-year-old "Sorry" singer was caught short as he tried to buy a foot-long sandwich, four bottles of milk and cookies at Subway in West Hollywood, reported Daily Mirror.
The pop hunk dropped by the store on Sunset Boulevard yesterday as his rumoured girlfriend Sofia Richie waited in his car.
Luckily, one of his loyal fans was on hand to foot the bill.
The source said a generous fan "recognised Justin and jumped in to pay for his order". We have contacted reps for Bieber for comment.
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