Bella just celebrated her 15th birthday and we're certain Zendaya was there to party it up with her.

Bella tweeted the picture above with the caption:

“Your my boo! I love you girl:) shiny dresses or sweat pants you are still you❤❤❤"

They seem like such great friends, fun, stylish and totally comfortable with each other!

It's great that these two can stay close on and off screen!

source: bop & tiger beat