Justin Bieber throws pre-b'day bash

Justin Bieber, who will turn 22 on March 1, recently threw a massive birthday party for himself.

The 'Sorry' hit maker on February 27 filled the Bel Air mansion with his closest friends, including Hailey Baldwin, Diddy and Lil Za, reports TMZ.com.

It is being said that Diddy presented Bieber a Bad Boys letterman jacket.