Carrie Underwood and Kelly Clarkson have been rumored to be feuding for years, but Underwood's decision to perform at Trump's inauguration has reignited it.

Football's Carrie Underwood is being called a traitor as she is set to perform “America the Beautiful” at Trump’s inauguration

Carrie Underwood might not be Beyoncé or Garth Brooks in the celebrity superstar ecosystem. But the singer’s participation in President-elect Donald Trump’s inauguration is nevertheless a sign of the changing tides.

Kelly Clarkson opens up to E! News' Keltie Knight about Carrie Underwood returning to 'American Idol' as a judge and the new season of 'The Kelly Clarkson Show' premiering Sept. 23. Kelly Clarkson ...