Markle, 36, and 33-year-old Prince Harry stepped out together on Christmas at England's Church of St. Mary Magdalene.
They joined Prince William and Kate Middleton on the official outing.
Markle performed her first curtsy for the Queen.
The newly engaged couple stuck close to the sides of the Duke and Duchess of Cambridge.
Markle beamed throughout her time at the church and seemed comfortable with the crowds.
Markle and Prince Harry will tie the knot on May 19 during a much-anticipated ceremony at St. George's Chapel at Windsor Castle in Norfolk, England.
Queen Elizabeth gave Markle a shout-out during her annual address to the nation.
Though she didn't mention Markle by name, Queen Elizabeth noted that she looked forward to welcoming "new members" to her family in 2018.
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