According to law enforcement, last week a woman was busted at a Bev Hills Rite Aid, and didn't have any ID on her. When cops asked her for her name, she said it was Robyn Rihanna Fenty ... which is Riri's government name.
When they asked her for her birthday, she said it was February 20 ... Rihanna's actual birthday.
The woman made one mistake though -- she said she was born in 1986 ... but Rihanna was born in 1988.
Obviously, cops knew they weren't dealing with the real RiRi, and the woman was cited for misdemeanor trespassing and was released. Nice try!