Both photos taken by photographer Alexi Lubomirski show the couple in the grounds of Frogmore House, Windsor.
In the first image, Harry poses in a navy blue suit alongside his bride-to-be who stuns in a sheer, glamorous gown.
The second black-and-white image sees the couple embracing, with Markle's diamond ring designed by Harry himself on full display.
The photographer Lubomirski said of the portraits, "Not only was it an incredible honour, but also an immense privilege to be invited to share and be a witness to this young couple’s love for each other. I cannot help but smile when I look at the photos that we took."
The photographs are released just one week after Kensington Palace announced on that Prince Harry and Meghan Markle will officially tie the knot on Saturday May 19 2018.