Kate and William left baby Prince George at home on Thursday morning (7 November), but they didn't have to travel too far to lend their support to the annual Poppy Appeal.
The royal couple invited Poppy Appeal workers to Kensington Palace before they hopped on the Poppy Appeal Routemaster bus outside their home and travelled the few minutes to High Street Kensington tube station where they met appeal staff and volunteers.
As you'd expect, a huge crowd gathered to catch a glimpse of the future king and his wife, who looked in high spirits as they chatted with poppy sellers inside the station.
According to reports, the royals didn't make their trip to the tube station public knowledge before arriving due to safety concerns, so no wonder passersby looked slightly stunned to see them!
Kate sat next to EastEnders actress Barbara Windsor on the bus en route to the station. Barbara had been in Covent Garden earlier that morning to officially launch the London Poppy Appeal.
Every poppy sold helps the Royal British Legion support the British Armed Forces past and present and their families.
London Poppy Day sees thousands of uniformed personnel from the Royal Navy, Army and RAF taking to the streets of London to promote the campaign and collect donations at 80 tube stations and railway stations around the capital.
Their fundraising target for 2013 is £37 million.
Meanwhile, Prince Harry and the Duke of Edinburgh paid their respects to fallen uniformed personnel at the Field of Remembrance at Westminster Abbey.