ThePopRewind on Instagram: "In 2011, the Billboard Music Awards witnessed an epic pop moment — Rihanna and Britney Spears performing the remix of ‘S&M’ together. Britney joined Rihanna for a sizzling verse, while Rihanna dominated the stage with her signature energy. Fans went wild as two of the biggest icons of the decade shared one unforgettable performance, proving that pop royalty knows no limits. #britneyspears #rihanna"