Mariah sings for Mickey in a very festive red dress as Ms Carey joins the Christmas celebrations at Disney World

By GEORGINA LITTLEJOHN All I Want For Christmas: Mariah Carey performs her festive classic as she joins in the celebrations at Disney World, FloridaIt's one of the most well-known Christmas songs of recent times that has been described as a 'holiday standard'.And being heavily pregnant with twins wasn't going to stop Mariah Carey belting out her Yuletide classic 'All I Want For Christmas Is You...