“My new bunny,” Stefani, 46, captioned the shot. “#Bestpresentever hi Halo.” She followed it up with a second pic that showed her new horse with a "fancy fringe" harness, and added the hashtag #cantbelivemylife.
The Voice coaches haven’t been shy about their romance since Us Weekly broke the news in November that they were dating.
Since then, the pair has been almost inseparable. They spent time at Shelton's Oklahoma ranch over the holidays, attended an Arizona Cardinals game last month, snuggled up on a cozy date night in Nashville and even attended a wedding together, where the “Used to Love You” singer caught the bouquet of Shelton’s hair stylist.
And although they won't be coaches together on The Voice this season, a source confirmed to Us that Shelton, 39, already asked Stefani to be his team’s mentor.