Kelsea Ballerini shipped her new single, “The Other Girl,” to country radio on April 20. “The Other Girl, which was penned by Kelsea, Shane McAnally and Ross Copperman, features vocals from pop star Halsey. The new tune is the second single from Kelsea’s 2020 self-titled album, following her Top 20 lead single, “Homecoming Queen?” Kelsea…