Lilibet's first birthday is set to be marked by Harry, 37, and Meghan, 40, at Frogmore Cottage, a stone’s throw from Windsor Castle.
Queen Elizabeth is set to meet with Prince Harry and Meghan's daughter, Lilibet named in her honour.
Reports revealed that the Queen freed up her diary to attend the first birthday party for Lilibet.
The Queen, 96, is likely to miss her favourite sporting event, the Derby, on Saturday, June 4, which is the day her great-granddaughter turns one, The Sun reports.
The British monarch has never met Lilibet, who was born in the United States.
Lilibet's first birthday is set to be marked by Harry, 37, and Meghan, 40, at Frogmore Cottage, a stone’s throw from Windsor Castle.
The Duke and Duchess of Sussex and their children will attend the four-day Platinum Jubilee to mark the Queen's reign and they will stay at the Frogmore Cottage.