Rihanna & Her Stylish Birthday Self Take A Ride On The London Subway [PHOTOS]

Rihanna's Fashion Oops
The singer shows off more than her talent in a white tank top.
Singer Rihanna turned 24-years-old today and she received tons of Happy Birthday tweets from fans and celebrities. Katy Perry tweeted:

@rihanna HAPPY BIRFDAY u hoodrat, bear, crazy, sexy ass, freaky whole bit beotch. I (heart) u so much. Keep it real tonight, as I know u will!

While her ex-boyfriend Chris Brown sent her an interesting tweet which she re-tweeted, adding: ‘Thanks! RT @chrisbrown: HAPPY BIRTHDAY ROBYN!

Rihanna is spending her birthday rehearsing in London ahead of her performance at the BRIT Awards at The 02 arena tomorrow night (February 21). The singer was spotted riding the subway in London today.