The "Dark Horse" singer added another memorable piece to her body-art collection to celebrate a big career milestone: headlining the Super Bowl halftime show. Perry was tapped to perform at the 49th NFL halftime ceremony in 2015, and needless to say, she set the stage ablaze with a power-packed routine. She got the Roman numeral "XLIX," which denotes the number 49, inked on the side of her right ring finger. She got the ink right after her set from her long-time tattoo collaborator, Keith "Bang Bang" McCurdy.