Article continues below advertisementChappell Roan knows how to own a stage - even when her outfit steals the spotlight.On September 20, the "Subway" singer kicked off her run of shows at New York's Forest Hills Stadium, and while the night was a total success, she had one unforgettable slip. Mid-performance, Roan suddenly realized she was showing a lot of skin.Article continues below advertisement"Oh my God, I forgot my bottom was just a thong," the 27-year-old Grammy winner said in a TikTok clip. Holding her hand to her backside, she admitted, "I look up at the screen and see my a--.