Jay Z rides the London tube to his concert

Rap mogul Jay Z surprised his fan by taking a ride in the London underground to attend his concert at the O2 Arena here.
Jay Z was joined by Coldplay frontman Chris Martin and Timbaland on Saturday. Many fans took to Twitter to share their celebrity spotting.
The group was also spotted at Waterloo station in Central London. Jay Z was all smiles as he sat on the Jubilee line train, wearing a white T-shirt, black jacket and gold chains.
"Seeing Jay Z on the tube getting mobbed arriving to O2!! #Buzzing Too starstruck to take a pic! #Jigga," a fan tweeted.

Another shared "coming off the tube and I see Jay Z casually walking up the next escalator next to me... EVERYONE GOES NUTS!!"
The rapper is in the middle of his Magna Carta Holy Grail Tour, with his next performance back at O2 on October 14.