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Playboy magnate Hugh Hefner‘s secret shame.

He can’t tell his "girlfriends’" apart!

And while the Viagra enhanced octogenarian, 83,  has 3 brand-spanking new blonde bunnies to call his own   including twin 19-year-olds, Hefner admitted he can’t tell one from the other.

But there is barely a difference in twin hotties Karissa and Kristina Shannon the men’s mag mogul admitted at the Playmate of the Year party.

"I have one little trick, one has a little mark," Hef revealed. "Other than that, I don’t know."

THAT may help in the case of the twins but in terms of ID-ing blonde bobbleheads Kendra Wilkinson and Holly Madison, Hefner remained mum.