Meghan Markle appeared close to tears during a moving Anzac Day dawn service where fiance Prince Harry honoured New Zealand and Australia's war dead.

During the poignant event staged as the sun's rays broke over the London skyline, Ms Markle looked emotional as the hymn Abide With Me was sung by thousands gathered at the New Zealand war memorial.

The US actress, who wore a grey coat and large brimmed hat, passed a cultural milestone when she, and Harry, were given a traditional Maori welcome.

The couple were welcomed by Te Ataraiti Waretini from Ngati Ranana - the London Maori Club - with a traditional hongi, the soft pressing of noses and the sharing of each other's breath.

Ms Markle was making her first appearance at a service marking Anzac Day - April 25 - the anniversary of the start of the First World War Gallipoli landings, and a national day of remembrance for Australia and New Zealand.