Justin Bieber turns 21 tomorrow, but he's already gotten quite a few fancy gifts -- like this custom 1965 Lincoln Continental!

Bieber's pals/Shots business partners John and Sammy Shahidi reportedly surprised the star with the sweet vintage whip at his music studio on Thursday, and later in the evening Biebs was seen cruising up and down the Sunset Strip in the tricked-out car, which has a leopard interior, among other classy features.

TMZ reports that the Shahidi brothers purchased the car for $20,000 and then had a local auto body shop work on it for several months. We bet Biebs loves it! And at this point, we've totally lost track of how many cars he has in his collection...