Prince Harry is rumoured to be planning a proposal to his girlfriend Cressida Bonas by the end of the year.
Insiders have revealed just how close the couple of 18 months are.
They are rarely seen together - he is reportedly trying to protect her from the spotlight - but behind closed doors the pair are getting serious.
According to the Daily Star, the royal security team are making plans for a potential engagement.
A source said: "The way it's looking now people close to Harry and Cressida predict an engagement by the end of the year and a spring wedding.
"Cressida is The One. He's so close to her. All the tell-tale signs are there.
"People have heard Harry talking about how special Cress is and about getting engaged.
The source added: "He says 'They are all waiting for me to propose any day', then he grins.
"It's his idea of a joke. He takes everything like this light-heartedly.
"We know his true feelings."
The pair made the most of their time away from the public eye this month, with a romantic trip to Africa - the country where his brother Wills proposed to Kate Middleton.
The source added: "Harry can't give her his mother's engagement ring as William has already given it to Kate. But he can show Cressida Africa and tell her about his anti-landmine work, a cause Diana was so devoted to."
Harry, 28, is apparently working hard not to put pressure on the 24-year-old and wanted to bring her to Botswana, to somewhere special to him - away from the press.
The insider insisted: "He is taking a lot of time and trouble to devote so much time to her and see her as often as he can. This romance is different.
"She is the special one. Everyone who knows them is saying that.
"Unless they have some major bust-up, the engagement will be this year."