The piece of body art features in the bend of his left arm and is simply the letter 'A'.
The Tiny initial is thought to stand for his mother and close confidante Anne Cox and joins a star and the song line ''won't stop 'till we surrender''.
The singer debuted the inking when he left studios in Kensington, West London on Wednesday (18.07.12).
Recently he was at his parents' home in Cheshire, England when hysterical fans surrounded his Range Rover car.
He got out to sign autographs and then climbed back in before parking in a neighbor's garage.
Fans chased him to his parents' property so he jumped into a Mini and drove off to go to a pub with friends.
A source told The Sun newspaper: ''He was furious. He doesn't mind signing autographs but when he can't get in his front door it is ridiculous.''
The band which consists of Liam Payne, Louis Tomlinson, Zayn Malik and Niall Horan recently revealed their desire for more male fans.
Niall said: ''We want to expand our fanbase. We want different people to like us.''
''It is actually great to know that there are people out there that love what we do since we put so much hard work into it.''