Gwen Stefani was thrilled when she learned her duet with Blake Shelton, "Nobody But You," hit number one on the country iTunes charts, but the surprise didn't end there. Blake unexpectedly joined her on stage during her Las Vegas residency, where they performed the hit song together, leaving fans ecstatic and wondering what’s next for the couple. Let’s watch the video to see their magical duet and the chemistry between Blake and Gwen!