Richard Castle and Kate Beckett have been keeping their sexy-sexy time under wraps ever since they hooked up that dark and stormy night in Castle's Season 4 finale — er, perhaps we should say trying to keep it under wraps.

While we expected Kate's best friend Lanie Parish to make the discovery — she was the first to notice Beckett's post-sex glow, after all — a new sneak peek from Episode 3, "Secret's Safe With Me," indicates that matriarch Martha beats her to the punch.

"Don't you think you should have the talk with her?" Martha asks her wayward son as they're packing up Alexis's childhood knickknacks.

"You mean the sex talk?" Castle asks with a look of confusion on his face. "Mother, I covered that ages ago. I learned so much..."

Oh, Rick, that's so not what Martha is talking about.

"I mean the you and Beckett sex talk," she says. "Save it, Richard. I knew the morning I walked in here the poor girl was hiding in the closet. Mothers know these things."

And there you have it, Castle fans! Are you surprised that Martha's the first to find out about Castle and Beckett? And more importantly, do you think their secret's safe with her?


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