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,

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,