Carrie Underwood took the stage at the 46th annual Academy of Country Music Awards show dressed in a form-fitting sparkling corset, black frilly skirt and red highlights streaking through her beautiful blonde hair as she belted out her former No. 1 hit, 'Undo It.'

As she prepared to launch into the song's second verse, Aerosmith frontman and current 'American Idol' judge Steven Tyler joined Underwood on stage as the crowd came unglued. With the auditorium members on their feet singing and clapping, the two finished out an electrifying performance of the former 'Idol' winners' tune.

Just as the applause started to soften, Tyler broke into the 1975 Aerosmith Top 10 hit 'Walk This Way,' as the fans and stars alike sang along.

Prior to Underwood taking the stage, she was introduced by Bethany Hamilton -- the surfer who lost her arm in a shark attack at 13-years-old, which Underwood plays in the upcoming film 'Soul Surfer.' The movie is slated to hit theaters in the United States and Canada on April 8. Look for Underwood to make a series of television performances this week coming week to promote the film, including 'The Tonight Show With Jay Leno' on Wednesday and 'The Ellen DeGeneres Show' on Thursday.

Watch Steven Tyler and Carrie Underwood Perform, 'Walk This Way' at the 2011 ACM Awards