The role Princess Beatrice's soon-to-be stepson will have in her wedding

Princess Beatrice has come up with a sweet way to incorporate her soon-to-be stepson into her upcoming nuptials with Edoardo Mapelli Mozzi.

Beatrice, 31, is set to wed the Italian property magnate, 36, next year in 2020 after a whirlwind 11-month romance.

Mozzi was previously engaged to Dara Haung, 37, and the couple have a two-year-old son, Wolfie.

With the former spouses on good terms, The Daily Mail is reporting Princess Beatrice wants to incorporate the toddler into the ceremony.

According to the source, she plans to have Wolfie as her fiance's best man, with Haung also invited along to the nuptials.

"She is totally happy that Beatrice will be developing a relationship with her son and is happy that he will attend the wedding as Edo's best man," the source told the publication about Haung.

News of Beatrice's engagement first broke on social media last month, with little sister Princess Eugenie sharing happy snaps of the couple on Instagram.

The 29-year-old took the pair's engagement photos, writing her own enthusiastic caption.

"I'm so happy for you my dearest big sissy and dear Edo," she said.

"It's been a long time coming and you two are meant to be."