Prince Albert II of Monaco's future wife looked "every inch" the royal on an official visit to Japan.

On her first outing to another royal household, former Olympic swimmer Charlene Wittsock was said to have looked "happy and relaxed" as she was introduced to Emperor Akihito and Empress Michiko of Japan.

It was her first official meeting with another royal family so it was a big deal but she seemed to take everything in her stride.

South-African born Charlene - who is due to marry the prince next July - was dressed in a navy blue skirt suit and curtseyed in front of the royal pair as her fiance stood by her side, before the foursome then enjoyed lunch at Tokyo's Imperial Palace.

An onlooker told Hello! magazine: "Charlene looked every inch the royal as she met the Japanese royals. She looked incredibly happy and relaxed as they all chatted together.

"It was her first official meeting with another royal family so it was a big deal but she seemed to take everything in her stride."

Earlier this week, the blonde admitted she was struggling to adjust to life in the principality of Monaco, ahead of her marriage to the prince, saying she had only made two friends since moving to her adopted homeland.

She explained: "The people I mixed with in Monaco didn't relate to my South African mentality or humour.

"Of course I've been subject to jealousy, but that comes with the territory. Although I have met some wonderful people since I've been living in Monaco, I regard them all as acquaintances. I only have two people I consider friends here."