(Cover) - EN Showbiz - Cameron Diaz has been bonding with Prince Harry in an exclusive London gym.

The Hollywood actress, who is renowned for her dedicated gym routine, has reportedly formed a friendship with Britain's Prince Harry after bumping into the royal in a private members' studio in South Kensington.

Cameron is keen to keep her honed figure whilst she's filming her new movie Gambit, in London, with Colin Firth.

The 38-year-old joined the venue, which boasts a spa, restaurant, library and media room, at the end of April where she met the younger sibling of the Duke of Cambridge. The 26-year-old royal introduced himself, and they have been coordinating their workout sessions.

"Since arriving in England, Cameron was adamant she would keep up with her strict exercise regime. Producers secured her membership at the ultra discreet, 3,500-a-year gym totally unaware Prince Harry was also a member," a source told British newspaper The Daily Mirror. "Since first clocking one another and saying hello, they have coincided visits on two further occasions."

The pair, who last met up 16 days ago, are believed to have struck up a good friendship. The source has revealed that Harry has even extended a social invitation beyond the walls of the plush gym.

"During the second one, they were pounding along on adjacent treadmills and Harry cheekily nudged-up Cameron's speed dial, suggesting a one kilometer race. Cameron agreed... and won," the source added. "They have become pretty friendly Harry even invited his new gym buddy out drinking with him and his chums."

Clarence House declined to comment last night. (C) Cover Media