Meghan Markle and Prince Harry have yet to announce their engagement, but the "Suits" star has already received a gift from Queen Elizabeth.

Queen Elizabeth is very generous to open her jewelry vault for Prince Harry's soon-to-be bride. According to Yes To Love, the monarch is lending the "Horrible Bosses" star one of her tiaras for the actress' big day with the royal prince.

Among the tiaras that Markle can choose from is the Strathmore Rose tiara, which is one of the Queen Mother's favorite. Queen Mary's fringe tiara is also available on the vault. The queen, herself, wore it on her wedding day.

The lotus flower tiara is another gem. Kate Middleton has used this headdress in 2013 in an event at Buckingham Palace.

The lotus tiara is "one of the prettiest of Queen Elizabeth's tiaras … arranged as a band of stylized lotus flowers and overreaching arches, with the graduated pinnacles surmounted by a single pearl," Geoffrey C. Munn said (via People).

It is not new for Queen Elizabeth II to lend her jewelry to her grandson's bride. For instance, Middleton wore a Cartier halo scroll tiara when she walked down the aisle to exchange "I Dos" with Prince William. The headband was the Queen Mother's gift to Queen Elizabeth when she turned 18 years old, Tatler noted. Aside from the Duchess of Cambridge, the monarch has lent it to Princess Margaret and Anne, Princess Royal.

Aside from lending tiaras, Queen Elizabeth may offer Markle more when she is already part of the royal British family. The "Dater's Handbook" star will have the opportunities to borrow the queen's accessories if necessary, Middleton did it on several occasions.

For instance, the Duchess of Cambridge was spotted wearing the monarch's diamond bracelet when she graced the Anna Freud National Centre for Children and Families (AFNCCF) gala on Nov. 7. The diamond Quatrefoil bracelet was reportedly handed down to Queen Elizabeth after her mother's death in 2002. The monarch was seen wearing it back in 1958.

For the said gathering, Middleton complemented the sparkly trinket with a floor-length black lace dress. She also paired it with diamond pendant earrings and a Prada clutch bag.

What do you think will Markle choose for her wedding day? Drop a comment below.

Prince Harry & Meghan Markle Queen Elizabeth is lending Meghan Markle a tiara for her wedding with Prince Harry. Pictured: Prince Harry and Markle attend a Wheelchair Tennis match during the Invictus Games 2017 at Nathan Philips Square on Sept. 25, 2017 in Toronto. Photo: Getty Images/Chris Jackson