The couple quietly exchanged vows in their backyard
Oprah With Meghan And Harry
Prince Harry and Meghan Markle
| Credit: CBS/Youtube

Before Meghan Markle and Prince Harry's televised royal wedding was a backyard ceremony just for them.

During her interview with Oprah Winfrey on Sunday, Meghan revealed that she and Prince Harry secretly got married three days ahead of their ceremony at St. George's Chapel on Windsor Castle on May 19, 2018.

She said the Archbishop of Canterbury performed a ceremony where they exchanged vows in their backyard.

"Three days before our wedding, we got married — no one knows that — but we called the Archbishop and said, 'This thing, this spectacle is for the world, but we want our union between us,' " Meghan shared. "So the vows that we have framed in our room are just the two of us in our backyard with the Archbishop of Canterbury."

For more on Prince Harry and Meghan Markle's interview with Oprah, listen below to the episode of PEOPLE Every Day.

Meghan, 39, also shared some details about the royal wedding watched by millions around the world.

Prince Harry, Meghan Markle
Prince Harry and Meghan Markle
| Credit: Ben STANSALL - WPA Pool/Getty

"I've thought about this a lot because it was like having an out of body experience I was very present for," she said. "That's the only way I can describe it because the night before I slept through the night entirely, which in and of itself is a bit of a miracle. And then woke up and started listening to that song 'Going to the Chapel.' And just tried to make it fun and light and remind ourselves that this was our day — but I think we were both really aware, even in advance of that just, this wasn't our day. This was the day that was planned for the world."

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The wedding of Prince Harry and Meghan Markle, Carriage Procession, Windsor, Berkshire, UK - 19 May 2018
Prince Harry and Meghan Markle
| Credit: ANL/REX/Shutterstock

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The Duchess of Sussex also said she went into the marriage "naively."

"I didn't grow up knowing much about the royal family," she said. "It wasn't a part of the conversation at home. It wasn't something that we followed."

When asked if she did any research when she started dating Harry, she said, "I didn't do any research. I've never looked up my husband. I just didn't feel the need to," she said.