The unexpected item Meghan Markle is allegedly going to wear at her wedding

There's one special item that the bride-to-be might wear on her big day.

As reported by Pop Sugar, Meghan Markle, 36, is likely to wear Princess Diana's tiara during the royal nuptials.

The former Suits actress and Prince Harry, 33, is set to wed at St. George’s Chapel at Windsor Castle on May 19, 2018.

The Royal fans were so excited and have been trying to uncover details about the upcoming royal wedding.

As part of the royal traditions, Meghan could only wear a tiara if she officially becomes Mrs. Henry Charles Albert David.

Sources claimed that on her wedding day, Meghan might wear the same tiara Princess Diana wore when she tied the knot with Prince Charles in July 1981.

Pop Culture reported that Diana gave the tiara to her brother, Charles, the current Earl Spencer, after the wedding. But Prince Harry could ask his uncle for the tiara and loan it to Meghan on their big day.

Kate Middleton, 36, also wore one of Diana's tiaras. In July 2017, the Duchess of Cambridge was spotted wearing the Cambridge Lover's Knot tiara when King Felipe and Queen Letizia of Spain visited the United Kingdom.

Kate wore it again at Queen Elizabeth II's winter party at Buckingham Palace in December 2017. But the expectant mother didn't wear one of Diana's tiaras when she married Prince William on April 29, 2011, at Westminster Abbey.

Instead, Kate borrowed a minor tiara from Queen Elizabeth II on her big day. She chose the 1936 Cartier halo headpiece which was given to the Queen for her 18th birthday.

Meghan is already the owner of some of Princess Diana's jewels. Her engagement ring includes two diamonds from the princess’s collection, along with a new Botswana diamond.

Meghan has been settling into her new life with Harry in London, since their engagement on November 27, 2017.

Their engagement came two months after they made their first public appearance as a couple during the Invictus Games in Toronto, Canada.