In the “Late Night” clip, posted to YouTube on November 24, Mulaney — who Page Six exclusively revealed has checked into rehab for cocaine and alcohol addiction — hosts a fake “Royal Watch: News from the Real-Life ‘Crown’” segment and jokes that Prince Harry and Meghan Markle were annoyed by COVID because it took all the media attention away from their Megxit “stunt.” Mulaney — wearing a rumpled, oversized coat and sunglasses, both gifts from Julian Casablancas of the Strokes, who performed on