David Letterman and his No. 1 TV Moment -- Talks about "Masters of Sex" and Tells Lizzy Caplan That He Loves Her As an Actress

Just before the premiere of "MASTERS ON SEX", Lizzy Caplan appeared with David Letterman to explain everything about the show and to hear the TV host say how much he enjoys her acting.

Of course in this interview, there are A LOT of laughs! Too bad David won't be around for the July 12 Season Three premiere of Masters! But now he'll have plenty of time to read the book, Masters of Sex.