Chris Daughtry and Kelly Clarkson duet on "Fast Car"

Daughtry fans got a nice surprise Sunday night when Chris brought fellow Idol alum Kelly Clarkson onstage during the band's set at its concert at Nashville's Bridgestone Arena. Watch the two duet on Tracy Chapman's "Fast Car" below:



Daughtry's 18-song set list featured guest appearances by 3 Doors Down's Brad Arnold (on "Whipping Post") and Lifehouse's Jason Wade (on "Home"). I think it would be fair to say that Chris and Kelly are two of the three biggest talent scores that show has and will ever produce.