Miranda Lambert has won the 2015 ACM Award for Album of the Year, for Platinum.

"That was a tough one. I love all of those albums so much," Lambert said upon taking the stage. "I have them all. Thank you so much for this. It means the world to us."

Producer Frank Liddell, who has produced all of Lambert's albums, also took a moment to offer his gratitude.

"I really want to thank you, and all of the musicians who have been with us from the beginning," he added. "It's been really special."

Lambert's Platinum debuted at No. 1 on both the all-genre Billboard 200 chart as well as the Billboard Top Country Albums chart, making her the first country artist in the history of Billboard to have all five of her albums debut in the top slot.

The record includes the No. 1 single, "Somethin' Bad," with Carrie Underwood, which won a 2015 Grammy Award for Best Country Album.

“There’s humor on this album, and nostalgia, and it’s feminine,” Lambert says of the record, which also includes guest vocals by Little Big Town and the Time Jumpers. “There’s girl power, not in the ‘I’m gonna burn your house down and kill you,’ but more where I am as a 30-year-old woman and wife. I’m more settled in life, embracing the good and the bad, and that’s all reflected on Platinum.”

Lambert is the most nominated artist of the evening, with eight nods, including the night's highest honor, Entertainer of the Year. She has won the ACM Award for Album of the Year three other times -- in 2008 for Crazy Ex-Girlfriend, in 2010 for Revolution, and in 2012 for Four the Record.

Download Platinum on iTunes.

Big Moments in ACM Awards History

How Well Do You Know the ACM Awards?