EXCLUSIVE: Rihanna travels in style to her show at London’s O2 Arena by taking the Tube. The superstar singer shocked London Underground commuters by squeezing into the cramped carriage en route to her gig. She could not even get a seat in the standing room-only carriage but did not seem to mind as she chatted to passengers including a group of teenage girls. Rihanna was cutting it fine for the show as she was on the Tube at 6.45pm local time – just 15 minutes before Calvin Harris was due to open for her.