Justin Bieber - Teen Choice Awards 2012

Justin Bieber heats up the pink carpet at the 2012 Teen Choice Awards held at the Gibson Amphitheatre on Sunday (July 22) in Universal City, Calif.

Before heading inside, the 18-year-old singer was all smiles as he posed in a Dolce&Gabbana shirt, Marc by Marc Jacobs pants, and Supra shoes.

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“Just gonna have fun with it tonight,” tweeted Justin. “I already won = my Beliebers, but regardless when it comes time to perform…we are going in!”

Earlier in the day, he tweeted a special message to his girlfriend, saying, “Happy birthday @SelenaGomez!!! everyone show love!!”