If you are not a fan of Taylor Swift, you are missing out. Swift, 25, has been going hard for her latest 1989 World Tour; bringing out star-studded acts old and new – Fetty Wap, Leona Lewis, Mick Jagger and more. Tuesday night, the “Shake It Off” pop star took her show to Scottrade Arena in St. Louis where HAIM, the pop rock band of sisters, were her opening act, and Nelly stopped through for a little “Hot in Herre” action. Check out the performance down bottom.