Country singer Brantley Gilbert’s wife, Amber, welcomed their third child on a tour bus in the middle of his concert on Friday. ... The “Tattoos” singer had just started his set when he received word that Amber was in labor. He’s seen running to be by his wife’s side as she was giving birth inside the tour bus. The video shows the bundle of joy as Gilbert is on the phone with his mother to tell her the good news. “You got a new grandbaby,” he tells her. The singer goes on to call his wife “a freaking savage.” After...