Live From New York, It's...Seth Meyers Sketches include ""Morman Winter Olympics,"" ""Brian Fellow's Safari Planet,"" ""Inside Barbie's Dreamhouse,"" ""Jarrett's Room,"" ""A Message From Martha Stewart,"" ""Astronaut Jones,"" ""HBO First Look: Gemin... (more)i's Twin,"" ""Channel 9 Action News,"" and ""The Leather Man."" The host/musical guest performs: ""Boys"" and ""I'm Not A Girl""

Britney Spears, Dan Aykroyd, Justin Timberlake