Rita Ora Steps Out in See-Through Top, No Bra

Rita Ora made a cool exit from her hotel ... and put a look of sheer delight on the doorman's face.

The singer and actress left her hotel in NYC on Thursday rocking a slick all-black suit with a musical note on her jacket, and -- most importantly -- a see-though leotard underneath.

And just to reinforce what you've already seen ... no bra. Rita didn't seem to mind the extra exposure her outfit brought on the streets of the Big Apple.

Neither do we.