'Mob Wives' Star Big Ang -- Teresa Giudice Is INNOCENT!!!

Teresa and Joe Giudice have a serious heavy hitter in their corner -- Big Ang from "Mob Wives" -- who tells TMZ she's convinced the alleged bank scammers are COMPLETELY INNOCENT.

"I feel like she's innocent and so is he," says Ang -- who knows a little something about the criminal justice system.

In fact, Ang is not only connected to the Genovese crime family -- but was once arrested in an undercover cocaine sting and pled guilty to an intent to distribute charge.

So, given her background, Ang believes she's the perfect person to give the Giudices some advice on how to handle their situation.