Pop superstar Justin Bieber treated a group of strangers to a free lunch on this week (begs01Dec14) after stopping at a sandwich store in Hollywood.

The Baby hitmaker was grabbing a bite for himself recently and decided to pay for other customers' orders too.

One of the lucky patrons shared a blurry photo of Bieber at the deli with her Instagram.com followers, alongside the caption, "Just saw Justin Bieber in Hollywood. He ended up buying everyone's sandwich who ordered".

Another user sarcastically took to Twitter.com to write, "Don't you hate when you're trying to buy sandwiches and Justin Bieber buys them for you?! Ugh how rude of him!"

The singer shared the news of his good deed by retweeting the photo to his 57.4 million followers on Wednesday (03Dec14).