Ahh, the beauty of young love.
He tweeted, "Happy Birthday @SelenaGomez gonna be a special day" then took her a donut shop in El Lay, then later spent a fancy evening at the Geisha House in Hollywood.
By the look on Selenita's face it looks like she really enjoyed her day with her man.
Happy 19th birthday, Selena!
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[Image via Justin Bieber.]