After 20 incredibly fruitful — yet oftentimes tumultuous — years on Nashville’s Curb Records, LeAnn Rimes has inked a new label deal. The singer-songwriter is now a part of the RCA-UK family, also home to the likes of Christina Aguilera, Usher, Snoop Dogg, Alicia Keys, Meghan Trainor, Beyoncé, Pitbull and…