Catherine, Princess of Wales, attends Trooping the Colour amid cancer treatment [Video]

Catherine, the Princess of Wales, has appeared at Trooping the Colour in her first public appearance since her cancer diagnosis.

The mother-of-three was spotted in a car arriving at Buckingham Palace with her husband Prince William and their three children — Prince George, 10; Princess Charlotte, 9; and Prince Louis, 6 – ahead of the parade on Saturday.

WATCH THE VIDEO ABOVE: Princess Catherine arrives at Trooping the Colour

Know the news with the 7NEWS app: Download today

It’s the first sighting of Kate at a public event since she announced in March she was undergoing chemotherapy after an unspecified form of cancer was found during major abdominal surgery in January.

At the time, her office said she would not return to public duties until her doctors say she is well enough to do so.

However, in a statement on Friday evening, Kate said she was “looking forward” to attending the parade with family, and hoped to join further public engagements over the …