They are both beautiful and talented blondes who have won a number of country music awards.
But that doesn't mean Taylor Swift and Carrie Underwood are best friends forever. Quite the contrary, in fact, according to Us Weekly sources.
"They hate each other," an insider alleges, explaining that Grammy executives were told to keep the stars apart this Sunday.
Underwood and Brad Paisley, as hosts, did mock Swift for her split with Conor Kenney at November's Country Music Association Awards.
And, overall, "Taylor feels Carrie is always rude to her, so she steers clear of her," an insider tells the magazine.
Swift, meanwhile, is expected to open this year's Grammy Awards. We'll be keeping a sharp eye on Underwood in the crowd as her bitter rival takes the stage.