Singer: Rihanna

Pop slash R&B singer Rihanna was spotted in London today while attending a photocall for the movie Battleship. The photocall was held at The Corinthia Hotel in London, England. Last night the singer surpised local brits when she caught "the tube" at Waterloo Station to see the rapper Drake in concert. Drake's concert was held at the O2 arena and following the concert, the duo met up and partied at the "Low" club in Mayfair. Reportedly, the duo left separately at around 3:30am...