Donald Trump thinks his wife will be a model first lady — and here’s the proof.

Decades before she was sporting designer dresses on the stage of the Republican National Convention as Mrs. Trump, Melania Knauss posed nude in a photo spread for a now-defunct French men’s magazine, The Post has learned.

The leggy, Slovenian-born model — then 25 years old and known by her professional moniker Melania K. — did the steamy photo session in Manhattan in 1995, according to Alé de Basse­ville, the French photographer who shot the sexy snaps.

(Photographer Alé de Basse­ville later told The Post that he misspoke, and the photo session actually took place in 1996 in Manhattan, and appeared in a 1997 issue of the magazine.)

The images, some rarely seen and others never published, were obtained exclusively by The Post.

The bombshell photos show Melania wearing nothing but high heels and pouting for the camera, in a series of images shot from the front, the back and the side.

“Melania was super-great and a fantastic personality and she was very kind with me,” de Basseville told The Post, adding the former model never once felt uncomfortable posing for the nude pictures.

Melania’s sexy photo spread appeared in the January 1996 issue of Max, a French men’s magazine that went out of business in 2006.

“I was quite surprised when I saw the pictures because it was . . . a racier shoot than I expected,” said a fashion-industry insider who was present for one of the photo sessions.

“But Melania seemed very comfortable with the whole thing, and she was very professional.”

For de Basseville, the inspiration for the pictures was the Renaissance and a celebration of the female body.

“I think it is important to show the beauty and the freedom of the woman, and I am very proud of these pictures because they celebrate Melania’s beauty,” he said.

At the time of the shoot, Melania had just recently arrived in New York City from modeling stints in Paris and Milan, Italy.

In Gotham she was booked for mostly commercial work and was later featured in an ad for Camel cigarettes, the source said.

When asked about the photos, Trump told The Post: “Melania was one of the most successful models and she did many photo shoots, including for covers and major magazines. This was a picture taken for a European magazine prior to my knowing Melania. In Europe, pictures like this are very fashionable and common.”

In 1998, Melania was introduced to Trump during a New York Fashion Week party at the Kit Kat club hosted by Paolo Zampolli, who was then representing Melania through his company ID Model Management.

The two wed in 2005 in a ceremony at Trump’s Mar-a-Lago resort in Palm Beach, Fla.