Little Big Town had a special guest with them Sunday night in Vegas at the 2015 Billboard Music Awards--Faith Hill herself. LBT's Karen Fairchild and Faith exchanged parts on 'Girl Crush' and the crowd couldn't get enough of it. You could see people in the crown mouthing 'wow' and 'that was awesome!'. Not to mention the cameras caught Taylor Swift eating up the performance and singing along as well.

Watch Faith Hill and Little Big Town sing 'Girl Crush'

Getty Images