“I could not have got through without you guys,” Mary tells Angie Kastanevas in the 'RHOSLC' Season 7 trailer. Mary Cosby will be center stage in the upcoming season of The Real Housewives of Salt Lake City, which premieres September 16. “You’rve been my strength, my sidepiece,” Mary tells her husband of 28 years as they sit in their church. ‘RHOSLC’ stars navigate crumbling marriages in season 7The rest of the Salt Lake City Housewives may well need that help. The Real Housewives of Salt Lake City Season 7 premieres Wednesday, September 16 at 8 p.m. ET/PT on Bravo.