Selena Gomez Boards Justin Bieber's Tour Bus

Selena Gomez hops onto pal Justin Bieber‘s tour bus after his concert at the American Airlines Arena on Saturday (December 18) in Miami, Fla.

Looks like these two are becoming quite friendly! Yesterday, Selena, 18, and Justin, 16, were spotted hanging out in South Beach.

Last weekend, JJJ spies spotted Selena in Justin‘s dressing room at Madison Square Garden during Z100′s Jingle Ball. She was also seen on the side of the stage while Justin was performing!

FYI: Below, Justin can be seen carrying a bag containing Pantene Shampoo and Proactiv skin care products.

10+ pictures inside of Selena Gomez boarding Justin Bieber‘s tour bus…