Madonna flashed a boob during her MDNA Tour stop in Istanbul, in the middle of her song “Human Nature”.

The Diva - who has the words 'No Fear' etched on her back - was performing a striptease during her song 'Human Nature' when she pulled down her bra and flashed the crowd one of her nipples. Scroll down to the video below.

If you've followed Madonna ever, you would know that this isn't out of the ordinary. Click here for the NSFW pic.