Stella Payne, 18 soon to be 19 is Liam Payne's twin sister. Ever since Liam had become famous by being in the international superstar band One Direction, Stella and her mom think it's best to pretend to be someone else, and not related to Liam and become sort of famous by being his sister and mom. Only Macy - Stella's best friend from diaper days knows that Liam is her sibling. But what happens when the lads of One Direction come home from their tour in the states and end up staying with Stella, her mom and Liam? Will Stella still be a secret existence to the world? Or will she finally be known as 'Liam Payne's twin sister'?