Gwen Stefani and Blake Shelton on season 22 of is starting to get personal!The married pair duked it out once again during Tuesday's Blind Auditions when 19-year-old Austin Montgomery wowed them with his performance of Hank Williams' «I Can't Help It (If I'm Still In Love With You),» earning chair turns from Gwen, Blake and first-time coach Camila Cabello.Gwen was blown away by Austin's old-school tone and he assured her that he's an «old soul,» who listens mostly to «everybody that everybody's grandpa would know.» Let's be real… I was the ONLY choice for @AustinMonOffic!!! #TeamBlake#TheVoicepic.twitter.com/8zk0nl1OJqThis opened the door for «Abuelo Blake,» as Camila calls him, to quiz his fellow coaches on their country music knowledge.«Austin, I think it would be very important for you to ask the three of us who sings that song you just performed,» he teased. «At least one of us knows who wrote and sang that song.»«What a jerk,» Gwen fired back.