LeAnn Rimes has been left exhausted after being selected as coach for two international seasons of The Voice – at the same time! Season 13 of The Voice UK is about to premiere on August 31 and we’ve just been treated to a glimpse of the coach line up. On August 23 The Voice UK released a video of the coaches performing a cover of Miley Cyrus’ Midnight Sky to YouTube. Fans were thrilled to see familiar faces returning to their screens, but a little surprised to see LeAnn Rimes joining the line-up, especially seeing as she’s currently filming for The Voice Australia. The Voice’s LeAnn Rimes chos…