They say never mix business with pleasure but when it makes for good entertainment, Blake Shelton is definitely going to do it. He obviously likes to cross that line every now and then. In a new promofor season 12 of The Voice, he jokes about “hooking up” with girlfriend Gwen Stefani. Entertainment Tonight reports that the clip shows Shelton and Stefani, along with fellow coaches Alicia Keys and Adam Levine taking turns speaking about what inspires them. It also gives viewers a sneak peek at their blind auditions antics, which include Stefani trying to win over a country artist by noting, “I just did a country song with Blake Shelton. I got the hookup!” Shelton responds by telling his lady, “That is so inappropriate to talk about us hooking up.” Season 12 of The Voice debuts February 27 on NBC.