"I'm proud of the man you've become," wrote Usher.

By Robyn Collins

It was a happy birthday for Justin Bieber. On Wednesday (March 1), the popstar turned 23 and he got plenty of online love from his twitter followers and celebrity friends.

Bieber’s mom quoted words from a famous children’s book, Love You Forever, in a sweet tweet to her son.

And everybody from Usher, and manager ScooterBraun, to Diplo had kind words for the hitmaker.

Related: Justin Bieber Shares Studio Update

Here are some of the best celebrity birthday tweets:

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