Blake Shelton and Gwen Stefani's adorable romance is on full display in a new live music video for their hit duet "Nobody But You."Blake shared the video on his Instagram, captioning it, "Man, I am a lucky guy."Blake Shelton and Gwen Stefani may be chart-toppers in the music scene... but their chemistry? Well, that's off the charts in this brand new live music video for their No.