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The singer confessed on her Twitter page that she had no fear in dropping her layers and baring it all.
“I’m comfortable getting them out - t*ts are t*ts.” News of the World quoted her as saying.
The 24-year-old recently posed in just a gold necklace for the latest edition of i-D magazine.
She was said to have covered an unusual feature, a third nipple, with her little finger just below her left breast.
An onlooker said: “Lily enjoyed stripping off. She’s proud of her body.”