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Zac Efron is a die-hard Lakers fan, and he's not too proud to wear Kobe on his chest to prove it!

The sexy 23-year-old actor hit up the Staples Center for Game 5 of the playoffs against the New Orleans Hornets. Looks like Zac's support helped the Lakers pull off a win ... 106 - 90.

Along with his Kobe shirt and LA cap, Mr. Efron rocked a Stand Up to Cancer hoodie. What a stud!

See which famous director also cheered on the Lakers ... after the jump.