Pictured: Lady Louise rides e-bike at Royal Windsor Horse Show

Lady Louise Windsor was spotted riding an e-bike at the Royal Windsor Horse Show, where she is volunteering for the international carriage driving Grand Prix.

Lady Louise sported a Royal Windsor Horse Show gilet as she rode the muddy electric bike along a path in the ground of Windsor Castle on day four of the event.

Her mother Sophie, the Duchess of Edinburgh, was spotted smiling and chatting to fellow showgoers nearby, alongside her husband Prince Edward, the Duke of Edinburgh.

Lady Louise has been helping out at the show, a favourite of the late Queen Elizabeth.

The 20-year-old is currently in her second year, studying English Literature at the University of St Andrews in Scotland.