Rihanna — Thongin’ Out in Risque Twitter Pic

Rihanna got a new pair of thigh-high boots yesterday … and to celebrate, she took a photo of herself wearing them … and a g-string.

RiRi tweeted the pic … along with the following message: “Gotcha bitch tip toeing on my marble flo”!!! Sick ass custom Prada boots! Miuccia you RULE!!! Thank you.”

No, Rihanna … thank YOU.