Carrie Underwood showed some serious thigh at Wednesday night's American Idol finale in a dangerously short celestial blue and white dress.

The 29-year-old superstar, who won the fourth season of the show, arrived at the Nokia Theatre in Los Angeles, CA, accompanied by her husband, hockey player Mike Fisher, and her mother.

Carrie's latest album, "Blown Away", has topped the country music chart for the third straight week; however it was knocked out of the number-one spot on the Billboard 200 Albums Chart by a fellow Idol album, Adam Lambert.

Lambert's sophomore album "Trespassing" debuted in the top spot this week, making history as the first openly gay male artist to have an album debut at number-one.

"WOW! #Trespassing made its debut at #1 on the Billboard 200 this week! Thank you to the Glamily for helping me make HISTORY!" The singer Tweeted.

Former Georgia 'pawn star' Phillip Phillips, 21, was named this year's American Idol during the finale, beating 16-year-old Californian Jessica Sanchez.

More pics of Carrie after her video...