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Eva Mendes hit El Corte Ingles in Madrid to launch their new Calvin Klein boutique. (Eva's the face -- and body -- of their new campaign).

In a demure yellow frock, Eva showed off what's underneath, posing in front of a big photo of herself in her skivvies.

In case you can't get a good look, we've re-posted the pic here:

Eva Mendes mendesbra.jpg image courtesy of Calvin Klein