Rachel strolled over to the Ed Sullivan Theater this afternoon to tape an appearance on the Late Show with David Letterman. That airs tonight at 11:35 pm ET. Their site says the other guests are Serena Williams and Elle King (Holy... You heard her version of that song?? I didn't think it could get dirtier.), so don't worry about trying to switch over at just the right time. Just watch it.
See also the Chicongo joke. :)