Rihanna was spotted riding the Tube around London today. It seems as if the 24-year-old "Birthday Cake" singer enjoys taking local public transportation in the United Kingdom. Last year, she posed for pictures with fans on the British subway while traveling to a gig at the O2 Arena.

Given Rihanna's unpredictable behavior, maybe you'll see her riding the train in your neighborhood soon.

[Def Pen]