Prince Harry and Meghan Markle posed for the cameras in the garden at Kensington Palace (Photo: Reuters)

Britain's Prince Harry and the American actor Meghan Markle have made their first public appearance since their engagement was announced earlier Monday, CNN reported.

Ms Markle showed off her engagement ring to the press (Photo: AFP)

The couple appeared at a photocall in the Sunken Garden at Kensington Palace in London on Monday afternoon, where Harry told reporters he knew Markle was "the one" from "the very first time we met."

Prince Harry and Meghan Markle pose for photographers outside Kensington Palace (Photo: AFP)

The Prince declined to elaborate on his proposal to Markle, but when asked whether it was romantic, he smiled and said, "of course it was." (Compiled by People's Daily app)