WATCH: Madonna bares bum during concert

While Madonna might be 53, she's certainly not shy about showing off her best ass-ets (pun intended). She's currently on tour in Europe with her MDNA concert series.

PHOTOS: More celebrity nipple slips

The pop star might have covered up on Monday when she arrived in Italy, but when she hit the stage on Tuesday night in Rome, she was anything but(t).

Editor's Note: We can see a pun pattern forming here.

During the song 'Human Nature' -- the same song she flashed a breast during in Istanbul over the weekend -- Madonna started to strip, this time choosing to reveal a black lacy g-string, fishnets and her rock hard derrière.

The pop star cheekily quipped, "I never know what's going to happen in this part of the show," and we have to say we think she's right. Although we hate to think what Madonna will eventually start flashing if she doesn't want to show the same thing twice.