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Tory Lanez was arrested on a gun charge after an argument outside a house party in the Hollywood Hills on Sunday.

TMZ reports the rapper was busted after police responded to a 911 call around 4:30 a.m. Sunday.

Witnesses told police that people were arguing in an SUV before someone fired shots in the air and the SUV drove off at a high rate of speed.

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A short while later police located the SUV and found Lanez and Megan Thee Stallion inside along with another woman.

Megan had a cut on her foot believed to be from broken glass on the floor of the vehicle.

Cops searched the vehicle and recovered a firearm. Lanez was taken into custody and booked into the county jail for carrying a concealed weapon without a license.

Earlier on Saturday night, Megan and Lanez attended a pool party at Kylie Jenner's upscale Holmby Hills home.