Now that we've shown you what's in the new Butter London makeup collection, it's time for you to experience the colorful creations for yourself. Global Colour Ambassador Katie Hughes will be traveling across the US and stopping at Ulta locations to give fans their very own "Rock Over." And as if you need any more reason to join the fun with Hughes and her team of makeup artists, you'll get a full-size bottle of Nail Lacquer in Chancer, a sparkling ruby red, with any $25 purchase. The Rock Over tour kicks off today in Seattle, with future stops in Los Angeles, Atlanta, Houston, Chicago, and more. Get the full details on all the tour locations here.