Bruno Mars: The Billboard Cover Story
Bruno Mars: The Billboard Cover Story

"I don't know," says Bruno Mars, kicking back in the opulence of a penthouse suite at the five star Sanderson Hotel on London's West End, "if it ever goes down like this."

The following day he'll play a blistering late-afternoon show to 64,000 sun-kissed British fans at the Wireless Festival (sponsored by Barclaycard), held in the U.K. capital's Hyde Park. But for now, the 25-year-old Hawaii native is enjoying a rare day off and reflecting on a "crazy surreal" journey that has seen him climb from childhood Elvis impersonator to the brink of global superstardom.

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