Sigma play 21 questions on Twitter
Find out why they are called Sigma
The duo behind the recent number one 'Glitterball' with Ella Henderson decided to play '21 questions' earlier today and you'll be surprised at some of the answers.
It started just after 2pm today (Friday 4th September) when they posted a tweet asking for questions.
This way quickly followed by a number of questions from fans ranging from who they would like to collaborate with, to what their favourite animal is.
We picked some of the best ones below.