Justin Bieber is now officially 18!

While appearing on The Ellen DeGeneres Show, Biebs was surprised on stage by his manager Scooter Braun.

Braun revealed to the pop star that he's the proud owner of a brand new $100,000 Fisker Karma ... a luxury hybrid car. We're lovin' JB's reaction!

Now, we have to wonder what girlfriend Selena Gomez will be giving the birthday boy.

Bieber's new single "Boyfriend" will be released on March 26.