As the Winter months get colder, Blake Shelton and Gwen Stefani's romance [1] continues to heat up. The Voice coaches took their new love [2] to Nashville this weekend to celebrate the engagement of RaeLynn, Blake's former teammate on the singing competition show. The ugly-sweater-themed party not only looked like an absolute blast but was planned by Blake himself. In one of the pictures RaeLynn uploaded to Instagram [3], the couple is seen showing off their holiday spirit in a festive photo booth. "Thank you @amandacraig12 and @blakeshelton for being the best hosts! Me and @josh_davis_18 are so thankful #destinedtobeadavis," RaeLynn wrote. Keep reading to see the Instagrams ahead, and check out the cutest photos of Gwen and Blake so far [4]!