The former X Factor winners were in the studio to chat about their new single - a cover of the 80s hit Word Up - which is the official song for this year's Sport Relief appeal.Following their chat with Eamonn and Ruth, the Belfast-born presenter quickly got up on his feet to bust some 'dad-dancing' moves, while singing the girls new song.Little Mix seemed delighted with Eamonn's effort, though no word yet as to whether he will be asked to join the group.The band has arrived back in the UK after spending the past few months conquering the notoriously difficult American market.Their latest album peaked at number four in the US charts and the group have been supporting singer Demi Lovato on her arena tour."We've been on such a journey," said band member Jesy. "We just feel so lucky to be in the position that we are in because none of us ever expected to be in the position that we are in."When we first got together we had these dream but we never thought we would go to America and get a number four album.Perri added: "We went over there and we were really nervous because we thought "right, they're not our fans, they're not going to know who on earth we are"."But then on the first night we just head (huge screams) when we were announced and we were just like "Oh, my gosh!" it was crazy."