Prince Harry and Meghan Markle will return to the U.K. in September to attend charities close to their hearts. So, is there a chance for them to meet Prince William and Kate Middleton? A royal expert doesn't believe so.

The former Fab Four may never reunite in the U.K. despite living close to each other. Prince William and Kate Middleton will be moving to Windsor this summer and Prince Harry and Meghan Markle may probably stay at Frogmore Cottage.

Royal biographer Angela Levin doubts if the two royal couples will ever meet in the U.K. The Cambridges are said to be "very busy" taking on a lot of royal engagements for Queen Elizabeth II.

The Duke of Cambridge may also want to avoid his younger brother, knowing the military veteran is about to drop his tell-all memoir. She told MailOnline that aside from moving home, the future king and queen also have to settle their kids, Princess Charlotte, Prince George and Prince Louis, first into their new schools.

She's also uncertain if Prince William wants to make amends with the Duke of Sussex. She believed it's difficult to happen due to the revelation he may made through his memoir. That said, they may still be waiting for what Prince Harry plans to do and may not see him and his wife until everything's out in the open and they learn what he has to say.

Speculations about the four's meeting are incredibly high, especially since they will live close to each other. Express noted that Prince Harry and Meghan Markle's Frogmore Cottage is only a few minutes away from Prince William and Kate's Adelaide Cottage. The two cottages are both in Windsor.

The latter's move will be in time for their children to start school. Despite that, it may be highly unlikely for them to meet.

In fact, The Telegraph reported there are no plans for them to reunite or even spend some time together. The two brothers are believed to have not spoken to each other in person since they unveiled the statue of their mother, the late Princess Diana, at Kensington Palace more than a year ago.

Prince Harry and Meghan Markle also didn't interact with Prince William and Kate Middleton when they went to the U.K. to join the celebrations for Queen Elizabeth's Platinum Jubilee in June. Anyhow, it still remains to be seen what will happen when the controversial royals arrive in the U.K. next month.