Carrie Underwood got a huge surprise when an American Idol contestant sang the "Sunday Night Football" theme song during an audition on Season 23 of the reality singing competition show this week.  Underwood,

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,

Several 'American Idol' hopefuls performed Carrie Underwood's hits when the country star joined the judging panel for season 23