Prince Harry and Meghan Markle
Prince Harry and Markle attend a state dinner at the Royal Residence on Oct. 25, 2018 in Nuku'alofa, Tonga. Getty Images/Paul Edwards

Meghan Markle walks behind her royal husband, Prince Harry, during their public engagements for a reason.

Many noticed that Prince Harry always walks ahead of his wife when they are out in public even if they are holding hands. Markle walks behind her husband to show their deep respect for the monarchy, according to etiquette expert William Hanson.

"It is standard practice for British royalty to allow the "blood royal" to walk or stand a few paces in front of the royalty who has married in to the family, as with HM The Queen and HRH The Duke of Edinburgh and TRH The Duke and Duchess of Sussex," Hanson explained to Daily Mail.

"Even though TRH the Duke and Duchess of Sussex are currently presenting their own, informal, tactile interpretation of British monarchy, they are still adhering to the precedent with Meghan knowing she, as a non-blood royal, should defer to born royalty," he added.

The publication noted that the Duke of Sussex is always several paces ahead of his wife when they visited Cockatoo Island, Fiji's Grand Pacific Hotel and the University of Suva on Wednesday. They were spotted in the same arrangement when they arrived in Tonga Thursday with Prince Harry leading Markle again.

According to Lisa Mitchell, a body language expert, Prince Harry has become more protective to Markle now that she's pregnant. The couple is also feeling more connected.

"He's in front of her with his arm overlapping her torso in almost every picture of them walking, showing that he's there to support her and be a protective barrier between her and others if she needs him to be," Mitchell explained.

"They are either holding hands while they walk or Meghan has at least one hand on Harry in every picture of just the two of them, indicating that they are really feeling connected and close during this exciting time," she added.

In related news, Prince Harry and Markle just replicated Queen Elizabeth II and Prince Philip's wave to the Fijian well-wishers at the balcony of the Grand Pacific Hotel. The monarch and Duke of Edinburgh also greeted the crowd in the same spot when they visited the country 50 years ago.