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The secret behind Anne Hathaway's perfect, porcelain complexion has been revealed: she gives her skin a break from makeup on her days off!

The bare-faced One Day star was spotted leaving a Brooklyn gym after getting her sweat on with a friend in NYC on Thursday.

The actress, 28, has been enjoying some R&R with her actor boyfriend Adam Shulman while her upcoming action flick, The Dark Night Rises, transitions from filming in Pittsburgh, Penn. to The Big Apple.

In the third Christopher Nolan-directed Batman installment, Hathaway plays the leather-clad, motorcycle-riding Catwoman.

"I just started to do Bikram yoga," the actress told Chelsea Handler in August about getting in shape to wear the skin-tight costume. "And right now, I'm, like, living on kale and dust."