Justin Bieber punched a guy in the face and threw him against a wall after the man grabbed a woman by the throat at a Coachella party, and would not release his grip on her ... TMZ has learned.
Sources familiar with the situation tell us Justin and a friend showed up at a party Saturday being attended by Patrick Schwarzenneger. Justin was talking to some people when a guy walked in, spotted a woman ... and went ballistic. Sources at the party say he appeared to be on drugs -- and it looked as if the woman may have been his ex-GF.
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