Hot, redheaded mom and actress Julianne Moore was recently on David Letterman and somehow the subject of oral sex came up.  I'm not sure who started it, but what happened next could prove to be very embarrassing or very funny - or both.

Video after the jump!

Julianne was telling David that she's already had the sex talk with her son Caleb, and explained that he could ask her any question pertaining to sex or to any word.  Caleb said to his mom, "Really Mommy, any word?"  Julianne thought, "Don't let it be fellatio."

Of course David Letterman, being David Letterman, could not let that one pass by.  He asks, Well, what does that mean?"  Moore, being quick on the wit, answers, "Ask your mother!"

Ha. Enjoy the video!

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