Luke Bryan is in Las Vegas for the 57th Academy of Country Music Awards, and having to make the trip out to Sin City was the perfect excuse to check out Katy Perry's residency show.Bryan spoke with ET's Cassie DiLaura over the weekend after rehearsals for his performance at this year's star-studded celebration of country music, and the singer opened up about seeing his friend and fellow judge bringing down the house in her residency show at The Theatre at Resorts World Resort and Casino.«I came in a day early to just be able to [see her show], because it's gonna be really tough for our schedules to intersect,» Bryan shared. «So, I mainly did that just to put a lot of pressure on Katy so she could come see my show.»Bryan recently wrapped up his own residency engagement at Resorts World Las Vegas — and is preparing for a second round in the near future — and the crooner said he was really excited about how it turned out.«It was great! I couldn't be happier with how it all went. I mean, the show felt like it was one of the best shows I've been able to put on and perform,» Bryan shared. «And I've also learned that I can live one month in Vegas without getting sent to the grave.»«As far as round two, I always want to build on the Vegas show.