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Justin Bieber showed his Chicago Blackhawks pride in Beverly Hills on Saturday!

The Canadian native is a big-time hockey fan -- when he and girlfriend Selena Gomez were in Winnipeg last week, they took in a game.

The singer, who is in town to shoot a spot for Proactiv, sported some funky glasses and a leather backpack and drove himself around. He's growing up so fast!

Indeed, Bieber's manager, Scooter Braun, tells the new issue of Billboard Magazine, that 17-year-old Justin's "balls have dropped."

Insightful!