The supermodel, 26, married Josh Kushner on Thursday wearing a custom white gown designed by the famous French fashion house's first female creative director, Maria Grazia Chiuri.
Kushner is the younger brother of Jared Kushner, President Donald Trump's son-in-law and one of his senior advisers.
"The wedding was intimate and moving", a friend told the magazine.
Karlie looked exquisite in a Dior gown with lace sleeves and a long veil, sweeping over an elegant bridal up-do.
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Trump tweeted congrats to the happy couple, writing, "So much love for you both as you begin forever together". According to People, the two got married in upstate NY.
It was a short engagement for Karlie and Joshua - they announced that they were getting married in an Instagram post back in July.
The pair, who have been together for six years, said "I do" in front of fewer than 80 guests, reports People.
The newlyweds have been dating since 2012, though they tend to stay out of the spotlight. "Yes a million times over", Kloss wrote on Instagram, along with an emoji of a diamond ring.