Prince William and Princess Anne at Trooping the Colour to mark the Platinum Jubilee (Picture: MOD Crown Copyright).

Princess Anne and Prince William together at Trooping the Colour in London (Picture: MOD Crown Copyright). — Picture: MOD Crown Copyright.

Prince William on horseback at Trooping the Colour (Picture: MOD Crown Copyright). — Picture: MOD Crown Copyright.

Musicians pictured at Trooping the Colour in London (Picture: MOD Crown Copyright). — Picture: MOD Crown Copyright.

Guardsmen take part in Trooping the Colour (Picture: MOD Crown Copyright). — Picture: Crown Copyright.

Prince William and Princess Anne at Trooping the Colour to mark the Platinum Jubilee (Picture: MOD Crown Copyright).

Princess Anne and Prince William together at Trooping the Colour in London (Picture: MOD Crown Copyright).

Prince William on horseback at Trooping the Colour (Picture: MOD Crown Copyright).

Musicians pictured at Trooping the Colour in London (Picture: MOD Crown Copyright).

Guardsmen take part in Trooping the Colour (Picture: MOD Crown Copyright).

The Queen

In pictures: Royals join Trooping the Colour parade

Prince William and Princess Anne at Trooping the Colour to mark the Platinum Jubilee (Picture: MOD Crown Copyright).

Princess Anne and Prince William together at Trooping the Colour in London (Picture: MOD Crown Copyright). — Picture: MOD Crown Copyright.

Prince William on horseback at Trooping the Colour (Picture: MOD Crown Copyright). — Picture: MOD Crown Copyright.

Musicians pictured at Trooping the Colour in London (Picture: MOD Crown Copyright). — Picture: MOD Crown Copyright.

Guardsmen take part in Trooping the Colour (Picture: MOD Crown Copyright). — Picture: Crown Copyright.

Prince William and Princess Anne at Trooping the Colour to mark the Platinum Jubilee (Picture: MOD Crown Copyright).

Princess Anne and Prince William together at Trooping the Colour in London (Picture: MOD Crown Copyright).

Prince William on horseback at Trooping the Colour (Picture: MOD Crown Copyright).

Musicians pictured at Trooping the Colour in London (Picture: MOD Crown Copyright).

Guardsmen take part in Trooping the Colour (Picture: MOD Crown Copyright).

The ceremonial Trooping the Colour is taking place at Horse Guards Parade in London, to mark the Queen's Platinum Jubilee.

Trooping the Colour is a celebration of the Queen's birthday, also known as the Queen's Birthday Parade.

It holds special status at the start of a long weekend of official events to mark Queen Elizabeth II's 70-year reign.

Cover image: MOD Crown Copyright.

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