Plot: One half of one of the most famous Hollywood couples is stopping by -- KATIE HOLMES! She's now playing one of the most famous wives, Jackie Kennedy, in the controversial new mini-series, "The Kennedys" -- and she's here to tell Ellen all about it. People can't get enough of KIM & KOURTNEY KARDASHIAN! The two are the queens of reality television and can hardly go anywhere without being swarmed by paparazzi