Gwen Stefani never kept track of the country music charts before meeting her now-husband, Blake Shelton ... Like Stefani, the “Ol’ Red” singer was also newly divorced.

Blake Shelton and Gwen Stefani co-headlined a massive ... And with that, he reached back to “Some Beach,” “Ol’ Red” and the concert’s emotional highlight, “Austin.” ...

Blake Shelton said following Gwen Stefani was the hardest job he's ever had at the WM Phoenix Open Concert in the Coliseum.