Celebrities and Bieber-family are rallying together on Twitter to wish Justin a very happy birthday!
Nicki Minaj ✔: Happy Birthday my G!!! @justinbieber ;p
Niall Horan ✔: Big happy birthday @justinbieber , have a good day bro !
Carly Rae Jepsen ✔: Happy Birthday to an incredible artist and friend. @JustinBieber ~enjoy 19!
Nicole Scherzinger ✔: Was working out at the gym this morning and ran into @justinbieber Happy Birthday Sweetie! xo
Ellen DeGeneres ✔: Happy birthday, @JustinBieber! The screaming fans, the Twitter following, the perfect hair — I’m sorry, I’m thinking of me.
Cody Simpson ✔: happy birthday to my mate @justinbieber see u tonight
Miley Cyrus ✔: I’m with every other @justinbieber fan. I wanna be at his birthday party! Shit gonnnnnna goooooo offfffffff! #turnup #19
Pattie Mallette ✔: Happy 19th Birthday @justinbieber!! First Bday I’m not with you! Miss u like crazy. Have a good one!!! Love mom. Xoxo
Ryan Butler ✔: ’Bout to be a C.R.A.Z.Y night out with the fellas.
Scooter Braun ✔: Spoke to the kid and wished him happy bday. He is gonna go hard tonight and well deserved. @justinbieber enjoy your day! Happy 19th Bday!!
Alfredo Flores ✔: HAPPY BIRTHDAY JUSTIN!!!!! Celebrations begin NOW! @justinbieber love u bro!
Jon M Chu ✔: Happy Birthday bro!! When some wait for you to fall, you fly. Thanks for always inspiring me. Here’s to 19! #Believe
Carin Morris ✔: Always a kid to me! Happy 19th @justinbieber. Love your whole face!
Ryan Good ✔: Happy birthday justin!!!