Carrie Underwood was taken aback by an American Idol contestant - not for the first time this series - and found herself singing along to her own anthem, "Waiting All Day For Sunday Night." The 2005 American Idol winner is now a judge on the hit show and was treated to a rendition of her famous song,

Carrie Underwood‘s American Idol journey has come full circle. Fans first met Underwood when she auditioned for season 4 of the singing competition. Following her 2005 victory, Underwood went on to become one of the biggest names in the country music world,