Clara Amfo and mathematician Dr Hannah Fry use numbers to explore Justin Bieber's career, calculating the maths behind the music to discover how his success adds up.

Ever wanted to know how much it would cost to have Bieber at your birthday party? How long it took to ink his face tattoo? Or perhaps you're just wondering about how many loos he's got in his LA mansion?!

Speaking to a host of experts including celebrity real estate agent, David Parnes, and Bieber's very own tattoo artists, JonBoy and Bang Bang, Clara and Hannah delve into the numbers to find out the stats that have made Justin the star he is today. Show less