Live from BBC Radio 1's world-famous studios, Cel Spellman counts down the weekly official chart.

Cel welcomes Internet sensation KSI to the show to answer viewers' questions and to take on another chart-topping celebrity in nooooote. Cel also tasks Millie with a chart-show challenge featuring Bastille! And Jack Garratt tries out his artistic skills in selfie-portrait.

And to top it all off, we play the tracks on the playlist that you voted for at bbc.co.uk/cbbc, and we count down the UK's Official Top 10! Show less