The musical, titled The Sixth In Line To Be King And I, will air on Radio 4 on New Year's Day. The "Rodgers and Hammerstein-inspired" piece will look at the Duchess of Sussex’s past and future as Meghan expects her first child with Prince Harry next year. It is described as an "inspired celebration of Meghan Markle's life to date".
And it will "look ahead to what promises to be an exciting 2019 for the happy royal couple as they expect their first child in the spring".
The regular cast of the 15 Minute Musicals series will star in the episode, with Pippa Evans playing Meghan.
It comes as Meghan and Harry are set to spend their first Christmas as a married couple.
The pair married at St George’s Chapel, Windsor Castle, in May following a whirlwind long-distance romance after being introduced by a mutual friend in July 2016.
Meghan's life and future will be the topic of a new radio musical comedy (Image: