'Mob Wives' Star Pia Rizza -- No Way in Hell I'd Do Porn

"Mob Wives" Chicago" star Pia Rizza is adamant -- the porn company offering her $100,000 to have sex on screen ... can take their deal and shove it somewhere they usually shoot .. up close.

Pia's response comes on the heels of an offer from porn producer Brazzers ... asking the 'Mob Wives' star to bare all in one of their nudie flicks ... after Playboy shot her down.

Pia tells TMZ ... even though she would have posed for Playboy, pigs will fly before she drops trou for a XXX film, saying, "ABSOLUTELY NOT! That is f***ing insane. A porn deal is not in my future."

She explains, "I am not that girl and I will not be doing porn!! I am a mother and it’s just not something I would ever do no matter how much they pay me."

FYI -- she's still down to strip for Hef, saying, "Playboy is on a different level. Everyone has done playboy because it's classier."