Niki and Sammy meet Union J backstage at the CBBC Official Chart Show

YouTube vloggers Niki and Sammy (AKA NikinSammy) duet with Union J and meet presenter Cel Spellman backstage at Radio 1 for the CBBC Official Chart Show! Watch more clips and join in with CBBC Official Chart Show For more fun, CBBC games and great makes visit CBBC aims to encourage children to find out more about existing interests and inspire them to develop new ones; helps them understand the world around them and prov