Harry Styles celebrated his sister Gemma Styles' birthday yesterday and left their waitress a $600 tip! The One Direction singer has made the most amazing gestures for fans' birthdays, so we're not surprised that he was that kind to the waitress who served his sister's LOL-worthy birthday cake.

CLICK HERE FOR AMAZING PICS OF HARRY AND GEMMA!

Her entire birthday party was reportedly loud, cheerful, and easy-going — it sounds like the perfect party!

Even when he gives Gemma a hard time, you can tell how much he loves his older sis.

We love that he treated his sister to a birthday dinner and was considerate of the restaurant and staff.

Do you think it's sweet that Harry left such a big tip? Would he be the best little brother ever? Let us know what you think in the comments!