Anne Hathaway
is one limber gal.

The "Devil Wears Prada" star was part of the Kennedy Center Honors tribute to co-star Meryl Streep that aired last night on CBS -- and she went all out for her segment.

No stranger to singing, Hathaway broke out into song ... and while her voice was impressive, it was the split she pulled off in a full gown that really stands out. Even Meryl looked shocked!

That flexibility could come in handy in her latest role: Catwoman in "The Dark Knight Rises."

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