And despite rumours of a family rift, the duo were all smiles as they arrived at Westminster Abbey.
Noticeably absent was Meghan Markle, who is believed to be taking it easy at home as she prepares to welcome her first child any day now.
Harry’s last-minute addition to the royal line-up indicates however that Meghan is showing no signs so far of giving birth soon, with the duke able to leave his wife to attend the hour-long memorial in central London.
American former actress Meghan is likely to be at home in the couple’s newly renovated Frogmore Cottage in the sanctuary of the Windsor Estate.
Harry and Kate will be joined by the Queen’s cousin the Duke of Gloucester, for the annual Anzac Day Service of Commemoration and Thanksgiving.
Meanwhile the Duke of Cambridge is in New Zealand where he paid tribute to those who lost their lives in battle by attending a service in Auckland.
WATCH: Prince William lays a wreath during Anzac Day service in Auckland
