Carrie Underwood just released the music video to “Last Name”, the third single off her sophomore album, Carnival Ride.

The song was composed and co-written by the 25-year-old American Idol champ. The video shows Carrie eloping in Las Vegas after getting liquored up. She wakes up the next morning to discover that she doesn’t even know her last name. In other words, Carrie married the man while she was wasted.

Watch the video below!

American Idol champ Carrie Underwood is the May 2008 cover girl for InStyle.

“My personal style changes day to day,” Carrie says of her revolutionary change in style. “But at the end of the day, I love sweats. I do enough glamming up for awards show and whatnot. So I can wear sweats whenever I want and it kind of evens itself out.”

Carrie adds, “I don’t think about awards shows until the day they’re there. I try not to stress about them too far in advance. That day, it’s just all about looking pretty. So I sit back and let everyone do all the work.”

She also lists Charlize Theron, Katherine Heigl and Reese Witherspoon as some of her fashion icons.

Check out the video of Carrie’s cover shoot with Instyle here. Pick up the issue on newsstands today!

Carrie Underwood performs her hit single “All-American Girl” onstage during the 2008 CMT Music Awards at the Curb Events Center at Belmont University on Monday in Nashville, Tennessee.

The 26-year-old American Idol champ closed the entire show in her cute baby blue babydoll dress! Watch the video below –

15+ pictures inside of Carrie’s picture perfect performance…

More Here! »

Carrie Underwood strikes a glamorous pose in a purple Badgley Mischka Platinum one-strap mini at the 2008 CMT Music Awards at the Curb Events Center at Belmont University on Monday in Nashville, Tennessee.

The 25-year-old American Idol champ accessorized with Tiffany & Co. jewelry, a Mary Norton clutch and Rene Caovilla sandals.

During the ceremony, Carrie performed, along with Alan Jackson, Brad Paisley, Sugarland, Taylor Swift and Toby Keith.

10+ pictures inside of Carrie Underwood @ CMT Music Awards 2008… More Here! »

Country music superstars Carrie Underwood and Keith Urban have been sharing the stage together on their “Love, Pain & the Whole Crazy Carnival Ride” tour.

Last night at the 1st Mariner Arena in Baltimore, Maryland, a newly single Carrie strutted the stage in thigh-high black boots and lamented about the lack of romance in her life.

“I don’t know how y’alls’ dating life is, but mine’s not so great,” said the singer, who recently split from Gossip Girl hottie Chace Crawford via text message.

Meanwhile, Keith celebrated his upcoming daddyhood “I’m gonna be a dad soon, and it only took me 40 years!”

Keith and wife Nicole Kidman are expecting their little one in July.

Newly single Carrie Underwood clears security at LAX airport in Los Angeles on Monday.

Earlier today, the 25-year-old American Idol champ revealed that she and Gossip Girl hunk Chace Crawford split ways via text message.

Be sure to watch Carrie covering George Michaels‘ “Praying For Time” on Idol Gives Back, which will air this Wednesday @ 7:30-10:00 PM ET/PT on FOX. Carrie also reportedly comes on stage when Desperate Housewives star Teri Hatcher covers her song “Before He Cheats.”

Sweatshirt by Ed Hardy. More Here! »

Carrie Underwood doesn’t need to mend a broken heart–she apparently broke up with Gossip Girl hunk Chace Crawford via text message.

YES, TEXT MESSAGE!

“It was completely mutual,” the 25-year-old American Idol alum told Extra. “We’re both fine…We broke up over text so…It’s like ‘peace out.’”

Continued Carrie, “It just didn’t work…And we both knew it didn’t work and no hard feelings at all whatsoever… I haven’t talked to him in awhile but, I mean, I don’t dislike him… So it’s no big deal.”

Dating can be tough in the public eye admits Carrie: “It’s difficult while you’re dating because people always make a lot bigger deal of things than they actually are… And then when you break up with somebody and then like two months later it comes out and it’s like you’re rehashing old stuff… I don’t know why that’s all out now.”

Carrie Underwood (in Farah Angsana) poses backstage during the taping of Idol Gives Back held at the Kodak Theatre in Hollywood on Sunday.

Carrie covers George Michaels‘ “Praying For Time” and also reportedly comes out on stage while Desperate Housewives star Teri Hatcher does her cover of ‘Before He Cheats.’

Carrie also is pictured with Desperate Housewives star James Denton.

Idol Gives Back will air April 9, 2008 (7:30-10:00 PM ET/PT) on FOX.

25+ more pics of Carrie at Idol Gives Back…