Justin Bieber -- Happy Birthday to Me!!!

Justin Bieber has all the money in the world to burn, so it was no problem throwing himself a massive 22nd birthday party.

Justin filled a Bel Air mansion Saturday with his closest friends, including Hailey Baldwin, Diddy and Lil Za.

Diddy presented the Biebs with a Bad Boys letterman jacket.

There was plenty of booze -- Ciroc, of course -- and dancing until the wee hours.