FREE Key Lime Donut at Krispy Kreme TODAY – One For You and One For a Friend This post may contain affiliate links. Please see the full disclosure policy here. Posted on May 15, 2013 Written by Mary 1 Comment Grab a FREE Key Lime Cake or Key Lime Cheesecake Donut at Krispy Kreme today ! Just head to your local Krispy Kreme donut store and check in on Four Square to grab one for you AND a friend. YUM!