Cameron Diaz befriends Prince Harry at gym?

Cameron Diaz has reportedly befriended Prince Harry at a gym.

The Bad Teacher actress, who is in London to film Gambit opposite Colin Firth, has been attending the same gym as the prince, according to The Mirror. The two have allegedly become exercise partners, timing their visits to the private members' studio in South Kensington to coincide.

"Since arriving in England, Cameron was adamant she would keep up with her strict exercise regime," a source said. "Since first clocking one another and saying hello, [Cameron and Harry] have coincided visits on two further occasions."

The insider continued: "During the second one, they were pounding along on adjacent treadmills and Harry cheekily nudged-up Cameron's speed dial, suggesting a one kilometre race. Cameron agreed... and won."

Prince Harry reportedly even invited Diaz out for drinks.

The 38-year-old Hollywood actress is believed to be dating American baseball player Alex Rodriguez. Diaz recently revealed that sex is her favourite sport, stating that she is always "in the mood".

Diaz can be seen next in Bad Teacher with Justin Timberlake. The comedy opens in cinemas on June 17 in the UK and on June 24 in the US.

Watch a trailer for Bad Teacher below (warning: explicit content):