It's been nothing but great news for OutKast fans already this year. Yesterday, Big Boi revealed that he will reunite with Andre 3000 on new versions of Frank Ocean's "Pink Matter" and T.I.'s "Sorry." And today, we're seeing footage of Daddy Fat Sax ripping up the Late Show with David Letterman stage with his killer live band. You can watch them perform "Apple of My Eye," off Vicious Lies and Dangerous Rumors, above.