While on her 'Stronger 2012' tour, Kelly Clarkson takes a turn and performs a song from another artist. In the past she has covered Katy Perry, Coldplay, Foo Fighters and more. During her Las Vegas concert, last Friday night, Kelly performed a Britney Spears song.

Before belting it out though, Kelly told the audience that she was excited that someone requested the Britney Spears song "Everytime," saying, "This is one of my favorite songs by Britney Spears."

To perform the song, she had to find a harpist!  Wearing a Pink Floyd t-shirt, Kelly performed the song and the crowd went crazy.

A couple of days later, Britney found out that Kelly Clarkson covered "Everytime" and watched the video and really liked the job she did:

Then Kelly replied to her, "Thanks girl! I love that song :)"

Watch Kelly Clarkson Covering Britney Spears' "Everytime"

Here's Britney's version.