Move over Carrie...Brad Paisley has a new duet partner...."Cartman" from South Park! 

Brad tweeted "Spent the day Sunday @SouthPark . You all might want to watch this Wednesday. So seriously." Brad has two scenes in the show as himself...first he'll sing the National Anthem before a Denver Nuggets basketball game and then he'll sing again with "Cartman."  The show airs tomorrow night on Comedy Central.