Prince George and Princess Charlotte. Picture: AP Photo/Kirsty Wigglesworth

Prince George and Princess Charlotte will be a page boy and bridesmaid at Prince Harry and Meghan Markle's wedding.

The couple - who are set to tie the knot on Saturday May 19 at St. George's Chapel in Windsor Castle - have announced that the eldest children of Harry's brother Prince William and his wife Duchess Catherine will have a huge role in the couple's big day.

Prince Harry's goddaughters Miss Florence van Cutsem and Miss Zalie Warren as well as Miss Remi Litt and Miss Rylan Litt, Meghan's goddaughters, will also take part in the the wedding. 

Miss Ivy Mulroney, four, the daughter of Meghan's good friend Jessica Mulroney, completes the list of bridesmaids. Alongside Prince George, Jessica's sons Brian and John will be Page Boys as will Prince Harry's godson Jasper Dyer.

It is not currently known whether Thomas Markle, Meghan's father, will be able to attend the royal wedding. If he can't make it, Meghan's mother Doria Ragland is expected to walk her down the aisle.