Riding the subway must be contagious. Rapper Jay Z commuted to his show at London's O2 Arena via the London Tube. After famously taking the New York City subway to his concert in Brooklyn last year, he made sure the underground trip happened again across the pond, this time bringing pals including Coldplay frontman Chris Martin and Timbaland. (10/12/13) Credit: INFphoto.com
They may be famous celebrities, but they can still ride with the little people! Check out the stars we've spotted taking mass transit.