posted by Hollie-Anne Brooks

This one is REALLY tough.

Jack and Jack are the Vine stars turned YouTube sensations turned fangirl-magnets. In the last three years or so, the boys have gone from being childhood best friends to having millions of fans around the world. Meeting on the first day of school, they bonded over the fact they both had the same name (Jack, if you hadn’t worked it out) and were wearing the same shirt; that day effectively changed their lives forever.

jack and jack

To date, Jack and Jack have 1.3 million subscribers on YouTube, 1.5 million followers on Twitter and an incredible 6.1 million followers on Vine.

But how well do you know the boys? Call yourself a fan? It’s time to take the ultimate Jack and Jack trivia quiz!