After popping up at Calvin Harris’ set and performing an impromptu show with her bestie Katy Perry, Rihanna rolled one up backstage, wrote “THUG LIFE” on her belly and took in the Dre and Snoop show atop a man’s shoulders. I’m assuming they know each other. If not, some guy had the time of his life last night! Ha! Check out more pics of Ri thuggin’ it out and footage of her shoulder topping below.