On Monday, Shelton tweeted a fake news story about drivers falling asleep at the wheel when listening to Bryan's music. "Wow! Just catching up on the news... Shocking! I have noticed some fatigue when @lukebryanonline comes on," he wrote.
The American Idol judge retaliated by referencing Shelton's newest songs, "Happy Together" and "Nobody But You," with girlfriend Gwen Stefani. "Your girlfriend is the only reason people are listening to your last two singles," he quipped back.
Shelton replied, "Hey, don’t hate just cause I know how to work the system!!!"