(PHOTO GIST): Rihanna Flashes Her Toned Bum Bum On Instagram [PHOTO] +18

Raunchy pop star Rihanna showed off her well-oiled butt in skimpy red undies under denim shorts which had been cut into a thong on her Instagram page.
But quickly deleted it later on.

The image was taken during the shoot for her latest single 'Pour It Up', with the caption:

And that's a #WRAP !!!!! #pouritupvideoshooT