With today's big announcement we add a poppy queen of hearts to a lineup that is already rich on great acts. RIHANNA (BB) has become one of today’s biggest stars in R&B, pop and hiphop. The Caribbean superstar's debut at Roskilde Festival will be another spectacular party under the Nordic summer sky. Rihanna’s talent, charisma, dance moves and long line of hits dominate a show filled with glamour, sex appeal and inescapable choruses. Convincing superstar
Rihanna has just released Unapologetic, her seventh album in just as many years. The first single from the album, ”Diamonds”, has been a no. 1 in 27 countries and is one of her very biggest hits so far. With 37 million sold albums, Rihanna is a major headliner from the poppy end of the genre scale.
The festival is one of the six biggest annual music festivals in Europe.
If Wiki teas is true for once last year show was attended by 130k people
Performing for a population the size of 1/3 of her native country's 
Only a bad chick could do it! Go RiRi!