The x factor winner had a very embarrassing wardrobe malfunction last night. Louisa Johnson put on quite an energetic performance in Sheffield on Thursday night. The singer was pretty confident when she came up on stage up until the wardrobe malfunction. Louisa donned short black skirt which was tucked into her waistband. Unfortunately for her, it wasn’t tucked properly, exposing her butt in the process. The singers outfit was racy as it is with her a pair of knee-high leather boots and a tabard with a thigh-skimming hemline. She paired this with colourful bomber jacket.