Melania Trump, 47, shunned her usual glamorous gowns in favour of a pinstripe suit.
The First Lady wore the charcoal grey and white ensemble with a crisp white shirt.
Adding a fashion-forward twist, Melania wore a black skinny tie undone loosely under her collar.
The trousers of the suit, which were oversized, came right down to the ground and mostly covered the black shoes Melania was wearing.
Melania topped the outfit off with a bouncy blow-dry, no doubt to add a feminine edge to her selection.
Sophie, 42, chose stripes as the basis for her outfit.
The Canadian Prime Minister’s wife looked chic in a 60s style A line dress.
The navy blue choice had a large white stripe at the front, and Sophie mirrored Melania with a large bow, the material of which came down over her front.
Sophie paired her dress with a small handbag which had bright red, blue and white stripes on the sides.
Her bare legs were topped off with a pair of nude and black court shoes.
Donald Trump, 71, joined his wife to greet Justin Trudeau, 45, and Sophie before posing for photos.
The foursome smiled warmly as they hugged each other hello, as they have met on several occasions in the past.
After meeting in front of the White House, all four sat in the Oval Office for talks.
Melania and Sophie have met before, at the Invictus Games, held in Toronto, Canada.
Melania sat next to Prince Harry, 33, at the games, and cordially greeted the Canadian Prime Minister and his wife.
In typical high-glamour style US First Lady Melania wore a Dior pant suit in a smart houndstooth check.