Million dollars? Check. A hot girlfriend? Check. 20 million Twitter followers? Check.

A high school diploma? Cross that one out in the list of Justin Beiber's stellar achievements.

The teenage pop star has just graduated from high school. We last saw him rubbing elbows with Floyd Mayweather and suddenly, he's showing the whole world his diploma.

"I just finished high school. I passed my test - I'm free! It was hard work doing school and work every day," the former YouTube sensation said.

How did he do it? Apparently, he continued schooling while being swamped with work. He did lessons and homeworks while on tours, guesting and recordings. For someone so young yet so rich and accomplished, why still bother getting that piece of paper that says "Graduate"?

Well, according to his mom, Pattie Mallette, she wanted the millionaire teenager to have a "back up plan".

"School was something my mom really wanted me to do, so I had do it for her," Bieber said. "I mean, this kind of lifestyle has given me a different perspective on life," he added.

"I've been able to travel the world. At school, usually you have to do a lot of writing and reading. I'm not really into that stuff. I like to be out there!"

A staple of the tabloids, news, and social media, Justin Beiber's presence is almost everywhere. Aside from his 20M followers on Twitter, Justin has been in recent big-time events, the most recent of which was the Floyd Mayweather bout. Beiber is also set to come out in a movie coming out soon.

Justin Beiber was discovered in 2008 by current manager, Scooter Braun, who came across his YouTube videos. Beiber was signed by Usher and the rest they say is history.

Beiber has sold more than 8 million albums worldwide and has been nominated for various awards, such as Best New Artist and Best Pop Vocal Album at the 53rd Grammy Awards.