On June 4, Prince Harry and Meghan Markle welcomed a daughter named Lilibet "Lili" Diana in honor of Queen Elizabeth II and Princess Diana.
For a limited time, the gown will be part of a royal fashion exhibit at Kensington Palace.
Before its premiere on Broadway, the musical about the late princess will be available to stream.
Both the actor and the princess were going through very public divorces at the time.