The 28-year-old actress said that the incident was only a misunderstanding, reported People magazine.
"I was walking out of the store to get my handbag out of the car. I had been harassed by a man - a man and this woman were basically trying to take my picture inside the store, and so I asked them to stop taking it, but they wouldn't ... They were like paparazzi but undercover," Bynes said.
According to the 'What a Girl Wants' actress, one of the security guards "knew she was leaving and would be back but that there was a miscommunication with another guard."
Bynes said she was asked not to return to the store.