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Allen, 23, was wearing an electric blue Little Bo Peep costume and stockings, a frilly top, lacy knickers and matching blue stockings with towering beige platform heels. As she sang at London's G-A-Y club from her new album 'It's Not Me, It's You', she cheekily bared her bottom to the audience.
"She's got a great figure with curves in all the right places. She looked absolutely fantastic," the Sun quoted Simon Roberts, 27, a fan of hers, as saying. The 'Smile' singer was later seen partying with her brother Alfie, 22, and his girlfriend Jaime Winstone, 23.