What Made Keith Urban Blush On The Ellen DeGeneres Show? (Video)

Earlier this week, Keith Urban stopped by The Ellen DeGeneres Show to talk about American Idol, his tour and his marriage to Nicole Kidman.  Sounds pretty normal.  So what made Keith Urban blush on The Ellen DeGeneres Show?

How do Keith Urban and Nicole Kidman keep the romance alive when they're apart?  Urban shared the details and a blush with the audience on October 28th.