Jay Z and Chris Martin take the London tube to Jay Z's concert Mon-14-Oct-13 18:10 Share this Superstars JAY Z and CHRIS MARTIN stunned fans on Saturday (12Oct13) when they hopped on the London Underground to make their way to the hip-hop mogul's concert at the city's O2 Arena. The rapper, who was recently estimated by Forbes magazine editors to have earned $43 million (£28.6 million) in the past year, decided to shun his life of luxury for the night and use the city's public transport to get to the gig with Martin and his producer pal Timbaland. The stars and their entourage turned heads as they waited on the platform at Waterloo station before joining other commuters on the Jubilee line to head to the gig venue in Greenwich, where Jay invited Coldplay frontman Martin onstage to duet on a rendition of Ain't No Love (Heart Of The City). The two pals had also performed the collaboration at Jay Z's gig at the O2 on Friday night (11Oct13). Jay Z is no stranger to public transport - he used New York City's subway system last year (12) to travel to one of his concerts at the newly-opened Barclays Center in his native Brooklyn, while his protegee Rihanna previously used the Tube in London to get to her show at the O2 as well. WENN.com You May Also Like Jay Z reckons he still could've gotten Beyonce if he wasn't famous! Jay Z feat. Justin Timberlake 'Holy Grail' - the video Jay Z gives a 16 year old her big break Become a fan of The Edge on Facebook and on Twitter .