Rapper G Herbo is facing a battery charge after an argument with his baby mama, Ariana Fletcher, allegedly turned physical ... TMZ has learned.
According to Atlanta Police ... the rapper and Ari got into it Wednesday morning -- mostly yelling at each other -- but at some point, cops say Herbo assaulted her. Cops say he then left the location with their son but later returned ... and after officers spoke to him, they arrested him for simple battery.
Cops say Ariana sustained minor scratches during the altercation, and right now it's unclear what triggered the alleged assault.