Blake Shelton hates it whenever Adam Levine, his rival on U.S. talent show The Voice, has a new pet project - because he's unbearable for weeks. The country singer and the Maroon 5 frontman have a love-hate relationship on the show, and Blake admits his fellow judge can be a real pain if he's passionate about something. "Adam is a 14-year-old boy trapped in a 30-whatever-he-is body - and that includes his attention span," he said. " When he gets on something, you need to take a (painkiller) Tylenol and get ready, because that's what you're gonna hear about for the next month."
