In typical Bieber fashion, the singer sang his bro "Happy Birthday" and even pulled a prank on him!
Bieber's dad, Jeremy Bieber, posted an adorable video online of the bros hanging out during the party. In it, Justin's seen kissing little Jaxon on the forehead right before he blows out the candle on his Power Rangers cake. Of course, Justin led everyone in singing "Happy Birthday."
The boys' dad kept the Bieber birthday family tradition going when he pushed Jaxon's face into his cake after he blew out the candles! Even though everyone thought it was funny, Jax didn't and he even started to cry! Aww! Justin laughed off the whole ordeal and said to the camera, "he did it to me too!"
Jaxon was quick to shake off the cake-face after everyone cheered him up. He was so excited he actually put his face into his cake again! LOL!
Watch the whole thing go down in the video above! Too bad they don't show what Justin bought him for his b-day...can you even imagine?