The Duchess of Cambridge made a surprise appearance alongside her husband Prince William on Friday (August 30), her first public engagement since the birth of their son, Prince George.

Catherine, or Kate as she is popularly known, showed up at the start of an ultra-marathon in Anglesey, North Wales.

The couple have lived in the area for several years, but are due to leave very soon.

The newborn Prince did not attend, but Kate said he was a model baby.

(SOUNDBITE) Duchess of Cambridge, saying (English):

"He is sleeping at the moment, hopefully it will be like that for a little bit longer."

The royal couple spent around an hour at the event and Prince William rang the bell to officially start the three-day 135 mile race.