British royals Prince Harry and Meghan, Duchess of Sussex. Picture: Reuters

Prince Harry and Meghan Markle have sent thank you cards featuring a black and white portrait from their wedding day to well wishers.

The loved-up couple tied the knot at St George's Chapel at Windsor Castle on May 19, and the royal fan Instagram account Letters Royal has now posted a photograph of the thank you cards sent by Kensington Palace.

The card - which has been sent to all of the couple's well wishers - features a candid black and white photograph of the Duke and Duchess of Sussex, which was taken by royal photographer Alexi Lubomirski.

The Duke and Duchess of Sussex's cards (c) Royal Letters

The card also includes a message, which reads: "The Duke and Duchess of Sussex have been overwhelmed by all the incredibly kind cards and letters they have received on the occasion of their Wedding, and are so touched that you took the trouble to write as you did.

"It really was most thoughtful of you and greatly appreciated by Their Royal Highnesses who send you their very best wishes."