The seating arrangement was in line with royal protocol, which states that couples aren't allowed to sit next to each other at formal events unless they are officially engaged.
The prince was seen sporting an "Invictus Games" polo shirt and jeans while the America actress also kept it low in a white button-down shirt with ripped blue denim jeans.
The pair not only made their first public appearance together as a couple over the weekend at the Invictus Games in Toronto, today they were caught in their first non-paparazzi photos together as a couple.
"We were seated beside one another with the PM and his wife and the First Lady of the US", Johnston toldITV News. "They believe she's going to marry Harry".
Social media reactions to the 20-minute meeting soon honed in on the unusual way Harry held his right hand while posing for photos.
Prince Harry and Melania Trump - dressed in a houndstooth suit - spoke for a few minutes in the afternoon, posing for photographs before the prince headed to give out the first medals of the Games at the driving challenge competition. When her romance with Prince Harry was confirmed, the staff on set were warned to keep their silence about the issue or else they will be fired.
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Meghan and Harry have been the subject of engagement rumors.
The couple sat with their heads close together as they watched the on-court action, leaning in to speak in one another's ears.
Prince Harry has made the move to Canada a few days earlier, in the greatest secrecy, in order to be able to see her handsome on the filming of the series Suits in which she plays. News, "It's, of course, very serious and both Harry and Meghan are focused on the future".
'Well I think it would be quite marvellous and I hope it would be quite marvellous for him and obviously it will help to bring us together, ' he said.
The couple appeared to enjoy the sports match, clapping along with the audience, while even chatting to other spectators sitting behind them.