Carrie Underwood has something very exciting to look forward to in just a few days, and neither she or her fans can wait.MORE: Carrie Underwood wows in lycra outfit you won't forgetThe country singer took to Instagram over the weekend to post a countdown ahead of her Las Vegas residency, alongside a behind-the-scenes video.In the caption, the award-winning star wrote: "3 days to Reflection! It has taken a lot of preparation to get here and can't wait for you all to see it!"VIDEO: Carrie