Young Money rapper Jae Millz got ARRESTED in New York.

Here's how it all popped off. Millz and his girlfriend (or ex depending on who you believe) were having an argument in his apartment. Many heated words were exchanged and at some point Millz' girl felt threatened.

She called the police. And when the police came they saw some marijuana in Millz' house and ended up LOCKING HIM UP!!

It's not clear when he will be released from jail.