The 32-year-old royal and the 'Suits' actress have been dating since mid-2016 and after their burgeoning romance was recently given the seal of approval by Prince Charles, the couple are reportedly set to meet the Monarch on March 26.
A source told the Daily Star newspaper: ''Meghan is headed to meet the Queen on Mother's Day.
''She's already been given the green light from Prince Charles, the next step is the Prince's grandmother.''
Prince Harry and Meghan, 35, have been dating for less than a year, but it was recently reported that the British royal was preparing to propose to his girlfriend.
Prince Harry is said to be intent on transforming his late mother Princess Diana's emerald tiara into a sentimental engagement ring so he can pop the question later this year.
A source said: ''Diana's jewellery collection was left in trust for the boys and Meghan apparently loves emeralds. For Harry, like Wills before him, using his mother's gems means the two loves of his life will forever be linked.''
The flame-haired Prince is reportedly working on ''something incredible'' with jewellers, so that he can give Meghan ''the same sentiment'' that his brother Prince William had when he proposed to the Duchess of Cambridge using Diana's engagement ring.
The source previously said: ''After Diana died, the boys both chose a keepsake from Kensington Palace when they moved to Charles' rooms in St James's Palace. Prince William picked his mum's Cartier watch, and Harry picked her sapphire and diamond engagement ring.
''But they had an agreement that whoever got engaged first would have Diana's ring - and of course that was William and Kate. Harry wants the same sentiment when he proposes to Meghan, so he is working with the jewellers to design something incredible.''
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