Cops in Arcadia, CA received a complaint about a man driving recklessly in a green Mitsubishi Tuesday afternoon ... and when they located the vehicle, they saw King behind the wheel.

A spokesman for the Arcadia Police Department tells us King was pulled over when cops witnessed the car making an unsafe lane change -- and when they approached the vehicle, King admitted he had been driving with an expired license.

We're told King was cited for the license -- not the reckless driving -- and immediately called a friend to drive him home.