If you're not sitting down, you may want to do so before we break this shocking news:
We know it changes everything you thought you knew about the squeaky-clean songbird responsible for such family friendly jams as "S&M" and "Pour It Up," but it's true. She even posted video evidence online over the weekend:
Yes, while the rest of us were sucking down beers at lame backyard barbecues, RiRi celebrated Labor Day by laboring to roll a bunch of blunts on a yacht, which we're assuming is pretty challenging.
But while it may have been a holiday weekend, Rihanna certainly doesn't need a special occasion to get blazed: