1 March 2013 9:40 AM, PST | HollywoodLife | See recent HollywoodLife news »

Niall Horan, Nicole Scherzinger and more celebrities are rallying together on Twitter to wish the Biebs a very happy birthday! Read the sweet messages. Plus, find out what Justin has planned for his ‘big’ birthday celebration!

As Justin Bieber tweets about a “big night ahead,” on his 19th birthday, March 1, celebrities, including his mom Pattie Mallette, are congratulating him on the new milestone!

Celebrities Tweet Happy Birthday To Justin Bieber

Nicole Scherzinger: Was working out at the gym this morning and ran into @justinbieber Happy Birthday Sweetie! xo

Niall Horan: Big happy birthday @justinbieber , have a good day bro !

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. »

- Christopher Rogers

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