Taylor Swift and Carrie Underwood are two of the biggest stars in the Country music genre. Both have seen major successes in the past, and both have given Grammy officials fair warning, to keep their counterpart away lest some unnecessary spat occurs. Swift, 23, cited Underwood’s lack of manners the reason for the issue, while no official comment has been made from Underwood’s camp, people at US weekly have confirmed that the crooners hate each other and this is not just a Grammy night fight. Underwood, 29, will steer clear of Swift, but I wonder how Carrie will feel during Taylor’s performance of a song off her latest album (RED) on Music’s Biggest Night. Hit the jump for more.