Britney Spears began teaching English to Rihanna in 2005 after Spears heard Rihanna’s single Pon de Replay from her Spanish-language album Music of the Sun. Britney saw a lot of potential in the Caribbean singer’s music career and knew that the only way she could achieve global success was if she knew English. Spears’ faith was validated when Rihanna released an English-language song, titled SOS, one year after the release of Pon De Replay and it became her first #1 single on the Hot 100 chart. Rihanna completed her education under Spears in 2011 and has since made herself into one of the top-earning singers in the world. Spears and Rihanna are pictured above at Rihanna’s graduation.