'RHOSLC' Jen Shah Gets Letters From 'Mob Wives' Renee Graziano in Prison

Jen Shah has made a new friend while behind bars .... former "Mob Wives" star Renee Graziano, who's providing the 'RHOSLC' star with advice through letters. Chris Giovanni, who reps both Shah and Graziano, tells TMZ ... RG has sent JS several…