Videos: 2011 Academy Of Country Music Awards Performances

Big names, big hair, big performances. 2011 Academy Of Country Music Awards were held at the MGM Grand Garden Arena on Sunday in Las Vegas and there were some amazing performances throughout the night.

American Idol champ Carrie Underwood and Idol judge Steven Tyler rocked out on stage with their duet. They sang 'Undo It' and 'Walk this Way' while the crowd went nuts.

No country awards show would be complete without Taylor Swift. She sang her 'Mean' heart out on stage and wowed the crowd.

Rihanna may not be country, but she's still one of the biggest singers in the world. She had a special duet with Jennifer Nettles of Sugarland.

In case you missed the big show on Sunday, here's a recap of the biggest performances of the night:

Carrie Underwood and Steven Tyler: The duo performed Carrie’s hit song “Undo It” and Steven’s classic “Walk This Way”.

Taylor Swift's "Mean" Performance...

Rihanna's performance with Jennifer Nettles of Sugarland. The pair sang a duet of “California King Bed”...see it below!