Taylor Swift-Carrie Underwood Feud Creates Grammy "Headache," Source Claims

Forget the latest man Taylor Swift may or may not be dating.

The Internet has been buzzing this week over the fellow singing superstar this artist may or may not be feuding with.

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Following an Us Weekly report last week that Swift and Carrie Underwood don't exactly get along, the Season 4 American Idol winner appeared yesterday on CBS and shot down that rumor.

There's no beef here, Underwood told Gayle King.

But sources have followed up with Us Weekly and claimed otherwise, labeling Sunday's Grammy ceremony a "headache" because producers had to ensure Taylor was not sitting anywhere close to Carrie.

Staffers were told to keep the beautiful stars "from crossing paths," the tabloid writes, even though an Underwood insider scoffs at the feud allegations and simply claims Carrie us "shy."

Lending further fuel to the feud fire?

After Carrie performed a rendition of "Blown Away," Swift "didn't stand," an eyewitness says. "Everyone else did."