The Real Housewives of New York City Season 7 Episode 18 Rumble on the Runway ( Air Date 2015-08-04 ) Genre Reality category. Overview "During New York Fashion Week, Bethenny and Heather join Sonja to see her clothing line, then wind up choosing her runway models; Ramona announces she's moving on with her life; Bethenny and Ramona cause a commotion during Sonja's fashion show.".