Underwood, the fourth-season American Idolchampion, won Best Country Solo Performance for "Blown Away."
"Wow! Thank you. Country music has always been so good to me, and I thank the good Lord that I'm a part of such a wonderful, talented, amazing family. There's a lot of people to be thankful for. Everybody at Sony and... Simon Fuller, all of my amazing people at [XIX Entertainment], everybody at [Creative Artists Agency] and [my agent] Jeff Frasco," gushed Underwood in her acceptance speech.
"Golly, the fans that have been coming out and watching us put on shows and supporting all of us -- you guys are the reason we get to do what we do -- my family, my amazing perfect husband, [Mike Fisher]. And this really, glory to God, thank you so much!"
In addition, Clarkson, who won American Idol's debut season, claimed the Best Pop Vocal Album for "Stronger."
"I'm so sorry, I got stuck to Miranda Lambert! There's a story and a song for later after alcohol. I'm just kidding children! I get nervous speaking in front of people. I didn't know I was going to win because I literally, I was so excited to be in a category -- fun., I have been covering you all summer. I'm sorry, I love that song. I think it's so awesome," began a rambling Clarkson as the audience laughed and cheered.
"I love P!nk. I love Adele and everyone I was in the category with... Anyway, thank you so much friends, family, label, my manager [Narvel Blackstock], thank you so much -- my fiance [Brandon Blackstock], who is sexy tonight ya'll. I did not think I was going to win, thank you!"
Underwood beat out Dierks Bentley's song "Home," Eric Church's "Springsteen," Ronnie Dunn's "Cost of Livin'," Hunter Hayes' "Wanted," and Blake Shelton's "Over."
Clarkson's album was honored over nominees "Ceremonials" by Florence and the Machine, "Some Nights" by fun., "Overexposed" by Maroon 5, and "The Truth About Love" by P!nk.