Prince Harry and Meghan Markle will announce their engagement "soon."

Prince Harry

Prince Harry

The happy couple - who have been dating just over a year - have reportedly already taken their relationship to the next level but the flame-haired prince doesn't want to tell the world about their happy news until he's celebrated with his relatives first.

A source told Us Magazine: "He [Harry] always planned to share the news only with family [Queen Elizabeth, Prince Charles and Prince William] at first so he could enjoy it before word spread. But they will make an official announcement soon."

The 'Suits' actress' friends believe they'll announce the news once Meghan has wrapped up her seventh and final season of her USA Network show in November. The insider explained to the magazine: "It'd be a security nightmare to do it [make the announcement] sooner. She'd be followed everywhere!"

And, once they have decided to share the news, the 36-year-old star will move from her home in Toronto, Canada, to Harry's mansion in Kensington Palace in London.

The insider added: "She'll relocate to London for sure.There, she'll be on hand to help plan a detailed media rollout. They will most likely hold a small photo call at Kensington Palace, with just one photographer and journalist invited. On the same day, they'll do a TV interview that will be syndicated around the world."

Since Harry, 33, and Meghan started dating, the brunette beauty has been given round the clock security because of her high-profile romance.

A resident living near Meghan said: "She hasn't been around much for the last few days - Friday night they were here. I tell you, when he's [Harry] here, the street is full of police and security people. They just go straight in and they don't come out."