TikTok superstar Addison Rae showcased her chiseled midriff as she left a spinning class in Los Angeles on Saturday. Work it: TikTok superstar Addison Rae, 22, showcased her chiseled midriff as she left a spinning class in Los Angeles on Saturday Addison wore a matching Alo Yoga two-piece top and bottom set and Asics running shoes. Workout fashion: Addison wore …