The `Baby` hitmaker has implored his fans to give 17 dollars to Charity: Water in order to raise $17,000 for clean water in developing countries.
Writing on his Charity: Water page, he said: "Together, we`ve made a big difference for many causes. Did you know that about 4,500 kids die each day from waterborne disease? By building clean water projects for villages that need them, we can prevent this! I want to make my birthday matter this year - let`s make it so more kids can grow up to have a 17th birthday like me. Join me to make a change.
"I`m really so grateful for my family, friends and fans - and I believe we can do something big to help bring clean water to people in need. Even if you don`t have $17 to give I just ask you to go out in your community and try and make a positive difference. Even the smallest act of kindness can go a long way. Thanks and God Bless! #makeachange."
Last night Justin stepped out in public for the first time with Selena Gomez, who he is reportedly dating.
The pair - who were spotted in a photo booth kissing and cuddling at the Vanity Fair Oscars after-party - even matched their outfits for the occasion, with 18-year-old Selena in a floor-length red dress while Justin wore a suit with a red pocket handkerchief.