Get ready for a party on this weekend's CMT Hot 20 Countdown. Tune in as we travel to Panama City Beach, Florida, for Luke Bryan's final spring break concerts. What's the craziest thing Bryan's seen from the stage? He tells us. What's the most infamous moment caught on camera? We've got the scoop on that, too. And Bryan explains a recent photo he tweeted. Also on the show, Shania Twain is returning to the road. As concert tickets sell like hotcakes, we reach deep into the CMT vaults for some vintage insight from this record breaking superstar. And is Steven Tyler of Aerosmith going country? Hot 20 investigates the clues.