Let's get one thing straight, people. If you're using Instagram to take photos of your sandwich, you're doing it wrong. Rihanna however, is using Instagram like a pro. The 25-year-old pop bad girl is a endless supply of "I don't give a f*ck" outrageous photos. Like this recent photo of her in a thong with the tag "Gotcha bitch tip toeing on my marble flo'!!!" These are RiRi's hottest Instagram shots... there will surely be more to come.