It was bound to happen! Scantily clad pop princess Britney Spears has finally announced she will join forces with the Material Girl, Reuters reports. Spears's recording company, Virgin Records, says the two have plans to sing a duet together — seeing as how they are mutual fans of each other's work. "The duet with Madonna is going to happen. Madonna is great. I grew up listening to her in my room... I was really happy when she said she admired me," Spears told reporters in Brazil at the Rock in Rio music festival.