Lady Gaga -- Just Mask

Lady Gaga did her best Rorschach yesterday while strolling around NYC for Fashion Week in some weird face mask.

The 27-year old singer hit the streets of Greenwich Village Saturday in what looked like chic hospital scrubs, the mask and freakishly tall high heels.

It's unclear who she's holding hands with in the pic ... but he clearly has no shame walking around with someone wearing that.