On Tuesday, Sept. 4 - just four days after he welcomes presidential hopeful Hillary Clinton to the show, for a seventh time - David Letterman's Late Show will have the senator's mister, Bill, as a guest. The former president is making rounds promoting Giving: How Each of Us Can Change the World, his new book on citizen activism and public service. (Clinton's tome is not to be confused with Monica Lewinsky's memoir "Giving," which is about something ohhhhh-so-different.)

Clinton will also appear on Oprah that same Tuesday.