Katy Perry: 2016
Pop star Katy Perry did her best to blend in at the 2016 ACMs, where she not only presented icon Dolly Parton with the Tex Ritter Award, but the unlikely duo also took the stage to sing a medley of the country star's hits.
Maren Morris: 2016
The 2016 ACMs was not only Maren Morris' first appearance at the ceremony, but it was her first-ever award show. For the 2017 ACMs, she's making a triumphant return as a nominee.
Kelsea Ballerini: 2016
Kelsea Ballerini went into the 2016 ACMs a nominee and walked out a winner as New Female Vocalist of the Year.
Ashton Kutcher: 2012
The actor showed up to present an award to Miranda Lambert in 2012 and dressed for the occasion.
Justin Moore: 2010
Justin Moore made his first appearance on the ACMs red carpet in 2010, but it wasn't until four years later when he won New Artist of the Year Award.
Luke Bryan: 2009
Luke Bryan first attended the ACMs in 2009, but now he's basically the king of the show. He's won four ACMs, and the 2017 ceremony will mark his fifth consecutive year as a co-host.
Lady Antebellum: 2007
This trio owned the night at their first ACMs by winning Top New Duo or Vocal Group and Top Vocal Group of the Year, and have a total of eight wins to their names.
Taylor Swift: 2006
Friendly reminder that the pop superstar got her start in country music and her first ACM red carpet appearance was in 2006, when she sported cowboy boots with her cute dress. She returned the following year to scoop up the award for Top New Female Vocalist.
Carrie Underwood: 2006
Carrie Underwood is a household name in country music today, but in 2006 she was fresh off her American Idol win and heading towards stardom. Since then, she's won 12 ACMs, making her one of the most awarded women in the history of awards.
Miranda Lambert: 2005
Miranda Lambert has won seven consecutive ACM awards for Female Vocalist of the Year but before that, she first appeared on the ACM red carpet in 2005, back when she was best known as a contestant on Nashville Star.
Dierks Bentley: 2003
A newcomer in 2003, Dierks Bentley won his first ACM award for Top New Artist of the Year in 2004. He and Luke Bryan will be co-hosting the 2017 ceremony for the second year in a row.
Keith Urban: 2001
The veteran country music singer made his ACM debut in 2001 and received the Top New Male Vocalist of the Year Award. He has become a staple at the prizegiving and attended every ACM awards ceremony since except for the 2007 show.