There was no shortage of memorable moments at the 53rd Annual ACM Awards in Las Vegas on Sunday (4/15). Jason Aldean earned the night's top honor Entertainer of the Year, marking his third consecutive win in the category. Aldean ended his acceptance speech by paying tribute to the victims of the Las Vegas shooting, saying, "To my Route 91 people, you guys are in our hearts always. I love you guys, and we love Las Vegas. Vegas strong, baby. Thank you."Miranda Lambert also had a big night, taking home her ninth consecutive award for Female Vocalist of the Year and becoming the most awarded artist in ACM history. When Lambert won the Song of the Year award for "Tin Man," she earned her 30th career ACM Award and broke Brooks & Dunn's record for all-time wins at the awards show. Lambert now has more ACM Awards than any other country artist in history.Despite not being in attendance at the show due to his twin boys being born, Chris Stapleton still picked up wins for Male Vocalist of the Year and Album of the Year for From A Room Vol. 1. Carrie Underwood got very emotional while she and Keith Urban accepted the Vocal Event of the Year award for "The Fighter." After Urban said how much of a pleasure it was doing this song with her, Underwood turned to him and said, "Thank you for having me. I'm still kinda shaky right now. Thank you, guys. Thank you, country radio."Jason Aldean, Miranda Lambert, Luke Bryan, Thomas Rhett and Maren Morris opened the ACM Awards by addressing the shooting at the Route 91 Harvest Festival in Las Vegas, with each artist speaking about the healing power of music in the wake of the tragedy. Jason, who helped plan the tribute, said they thought about starting with a musical tribute, but said it was a lot bigger than a single song. Aldean said, "It's everything you'll hear tonight - the songs that bring us to our feet, make you wanna pull someone close, or just live in the moment. Nothing can take that away from us."Several people in attendance at the show were spotted wearing "58" and "851" gold pins, representing the number of those killed and injured in the Route 91 Harvest Festival shooting in October.Performing publically for the first time since her fall last November, Carrie Underwood took the ACM stage to debut her brand-new single "Cry Pretty." Carrie wore a short, sparkly dress for the performance, with glittery mascara applied under her eyes in the shape of tears. Carrie's return clearly made an impression on the audience, with her performance getting a resounding standing ovation from everyone in the house.The ACM Awards celebrated some of the most iconic songs of 1993 with a series of collaborations as part of their inaugural "ACM Flashbacks." Alan Jackson and Jon Pardi were the first to give an "ACM Flashback" performance, singing Jackson's massive hit "Chattahoochee." The second Flashback performance of the night featured Blake Shelton teaming up with Toby Keith to perform Toby's hit "Should've Been a Cowboy." The throwback segment then later wrapped up with Reba teaming up with Kelly Clarkson to perform Reba's hit "Does He Love You." During their performance, Reba donned her iconic red dress that was made so famous at the 1993 CMA Awards.Kane Brown and Lauren Alaina performed their duet hit "What Ifs" in front of backdrop that resembled the coastal seascape from the song's music video. The performance ended with Kane and Lauren getting within inches of each other as they stared deeply into each other's eyes. The two friends then gave each other a big hug.