According to "Us Weekly", TAYLOR SWIFT and CARRIE UNDERWOOD "hate each other" . . .and ordered Grammy execs to keep them separated at Sunday's show. However, Gossip.com found a friend of Taylor's who claims it's "100 percent untrue." Also . . . Taylor just found out last week that she's the opening act.

MINDY MCCREADY admitted to the Department of Human Family Services that she's been drinking again . . . so they placed her two sons into foster care. And an Arkansas judge ordered her committed to a treatment facility to deal with "mental health and alcohol issues".

GLORIANA recorded a riveting behind-the-scenes look at rehearsals for their upcoming tour with ALAN JACKSON.