Meghan Markle's body language is said to have revealed the truth about her marriage to Prince Harry before their Windsor wedding, according to a body language expert.

"Biology does not lie," said body language specialist Bruce Durham, aka Believing Bruce, as he discussed the Royal couple's bombshell with Oprah Winfrey, in which former Suits actress Meghan said she and Harry secretly married three days before with only the Archbishop of Canterbury present.

"No one knows that," Meghan said in the interview, "but we called the Archbishop and just said, 'Look, this thing, this spectacle, is for the world, but we want our union between us.'"

Since then, the Most Reverend Justin Welby has stated that he did not sign any official documents prior to the couple's Windsor wedding on Saturday, saying that doing so would have been a "significant criminal offense."

He said, "On Saturday, there was a legal wedding. I signed the wedding certificate, which is a legal document, and if I had signed it knowing it was fake, I would have committed a serious criminal offense."

Bruce claims he has discovered three distinct signals from Meghan and one from Harry that reveal the truth.

Bruce, who was concentrating on the video of Oprah and the couple in the chicken pen, turned to Meghan first.

He believes it's vital to dissect the two seconds before people answer a question because that's when they hit a T-junction.

"You'll note she touches her nose, and there's almost an inhalation of breath, so that's the pain I'm getting for something," he clarified.

He describes Meghan as having a "Pinocchio moment" by rubbing her nose.

Meghan then discusses the ostensibly private wedding ceremony.

After saying they secretly married with only the Archbishop present, Bruce claims she is "very dramatic" with her hand movements at this stage.

"Biology doesn't lie," he said. "Meghan, this is a fascinating, evocative, and maybe slightly inauthentic fact."

Meghan then makes a series of 'eye blocks,' he claims.

"Meghan is attempting to disassociate herself from potentially - we must be fair and balanced - the lie she is telling," he says.

As the camera pans out to a broader shot of the couple seated across from one another, Bruce notices Meghan waving her hand around like a conductor.

He said, "When she mentions the wedding during this period, she does this thing with her hand. It's as though she's attempting to be the conductor."

Meghan may be trying to remind Harry of their wedding day, according to the body language specialist.

"It is a weird thing she's doing with her hand. I don't need a reminder to recall when I got married."

"There's this enthusiastic gesture, as though it's a signal or cue to say, 'go with it,'" says the narrator.

As soon as Oprah turns around to look at him after Meghan talks about the wedding, Bruce says Harry "disengages" and is "gone to play with the chicken."

Bruce compares it to two people meeting in a park to walk their dogs, but feeling uncomfortable, they instead speak to the dogs.

He elaborated: "When Harry sees Oprah staring at him, he disengages and breaks eye contact. This is where the cue comes in.

"He doesn't want to be a part of the conversation because it makes him feel uneasy. There was something going on in Harry's head there that made him feel uneasy enough to turn away."

Bruce claims there is some truth in what the Archbishop of Canterbury is saying, despite his failure to say so conclusively.