Amanda Bynes has reportedly been hospitalised on a 5150 hold after apparently starting a small fire on the driveway of someone's home on Monday (July 22).

Law enforcement sources told TMZ that the fire department was called to a house in Thousand Oaks, California after Bynes was found standing on the property next to a campfire.

The website adds the sheriff's deputies questioned Amanda over what she was doing, and based on her answers, was placed on a 5150 hold - which is an involuntary hospitalisation for mental evaluation.