Prince Harry and Meghan Markle announce they're expecting their second baby

Congratulations are in order for Prince Harry and Meghan Markle!

The Duke and Duchess of Sussex used the most romantic day of the year, Valentine's Day, to announce the happy news that they are expecting their second child - a sibling for their 21-month-old son Archie.

"We can confirm that Archie is going to be a big brother. The Duke and Duchess of Sussex are overjoyed to be expecting their second child," a spokesperson for the couple said.

The news was announced with a stunning black-and-white photo taken by their friend and photographer, Misan Harriman.

Harriman snapped the image of a smiling and barefoot Meghan remotely on an iPad.

Meghan is seen cradling her baby bump in a flowing dress, by Carolina Herrera, one she previously wore when pregnant with Archie.

The extra special news comes after the royal couple revealed they suffered a heartbreaking miscarriage in July last year.

"Losing a child means carrying an almost unbearable grief, experienced by many but talked about by a few," Meghan wrote in a moving New York Times essay about her experience on November 25.

Meghan and Harry officially stepped down from their roles as senior royals last year.