Looks like Jessie J took the lyrics of the song Price Tag a bit too seriously when she was younger. The singer literally forgot about the price tag, instead deciding not to pay for clothes.
The singer has admitted in her autobiography that she once stole from a store. She writes
I stole a hoodie once from Atlantic Clothing that had ‘It wasn’t me’ written on it, when the Shaggy tune was big. Security didn’t find it funny when I said I was joking.
I don’t blame the security guard for lacking a sense of humour. I wouldn’t find it funny if someone tried to steal from me either.
Thank God she didn’t make a habit of nicking things from shops, or she may have been singing her tunes from the comfort of a prison cell.