By Nick Selbe The nine-time Grammy Award winner will headline this year’s halftime show in Glendale, Arizona. Glendale, get ready for RiRi. Just over four months ahead of Super Bowl LVII, nine-time Grammy Award winner Rihanna has been announced as the Super Bowl halftime show performer. The announcement comes after rumors circulated earlier in the week that Taylor Swift would be tabbed to headline the event. “We are thrilled to welcome Rihanna to the Apple Music Super Bowl Halftime Show stage,” NFL head of music Seth Dudowsky said in a statement, per Alex Weprin and Abbey White of the Hollywoo…