Ex-beauty queen .. Donald Trump was not rough with me....

Former Miss Teen USA Katie Blair says Donald Trump is far from the sleezy guy he's being made out to be.

Katie was Miss Teen USA '06 and Miss CA USA '11 ... and Trump owned both pageants at the time. 

Katie says anyone who's had any experience with live TV would know there's an obvious reason why Trump couldn't have done many of the things some other pageant contestants have accused him of doing.

Check out her take on Trump -- who stood by her during her scandal with former Miss USA Tara Conner. Katie's clearly got his back when it comes to his ethics.

As for whether he's got her vote? Katie's made her decision, though it's hardly a ringing endorsement.

source: TMZ.