Justin Bieber watching BFF Lil Za get in the ring during a college fight night in Valley Glen, Los Angeles, California on April 25.
Justin and Hailey Baldwin sat in the front row and held up a sign saying, “WE LOVE YOU ZA” … as JB’s posse member made his boxing debut.
Once the bell rang, Lil Za actually held his own … and looked pretty good as he traded blows with his opponent at the gym at Valley College.
Ultimately, Za WON the fight by decision … and even got some props from pro boxing superstar Andre Berto, who happened to be in the crowd.
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Check out the footage below: