GG from 'Shahs of Sunset' -- BF BASHED ME FIRST ... I've Got Bloody Evidence

GG from "Shahs of Sunset" claims her ex-BF beat her face in long before he got a restraining order against her ... and the reality star says she has the bloody photo to prove it.

TMZ has learned ... GG filed a police report in Las Vegas back in May, claiming then-boyfriend Sean Sette slammed a door in her face following an explosive argument in a hotel room at the Palazzo.

In the police report, GG claimed she suffered a bloody nose ... and took a photo to prove it ... which shows blood smeared all over her face.

TMZ spoke with Sette ... who acknowledges they were arguing that night, but says he did NOTHING wrong.

Law enforcement sources tell us ... the cops submitted the case to the Clark County DA, but no charges were brought against Sean due to a lack of evidence.