Kanye West and Kim Kardashian
and Kanye West
are like any other couple, says the former editor of French Vogue
"They are so normal," Carine Roitfeld told PEOPLE at the N.Y.C. premiere of the new documentary film, Mademoiselle C
, on Friday. "They are lovely together."
The film is about how Roitfeld started the edgy new CR Fashion Book
after her 10-year run at French Vogue
Kardashian, who sports a gold grill
on the cover of the latest issue of Roitfeld's magazine, was expected to make her first official post-baby appearance at the premiere and the afterparty at The Four Seasons Restaurant, but ended up canceling.
West, 36, did make it to the Absolute Elyx-sponsored fête – albeit quite late.
"He came because Carine is a good friend of his," says a source close to the singer, who appears briefly in the film.
Roitfeld revealed that she met Kardashian, 32, through West "because he is so into fashion, of course." "We decided we would do a story about her. Immediately she said, 'Yes.' "
Chanel's Karl Lagerfeld shot Kardashian's provocative high-fashion spread
when she was eight months pregnant
with her now 3-month-old daughter
But the mom-to-be was no diva during the shoot. "She was one of the easiest models I have ever worked with," Roitfeld tells PEOPLE. "She's not a model, but she was pregnant, you know, and I love pregnant women. Honestly, she was very, very nice. She made no demands at all."
While Roitfeld has spent time with Kardashian and West, she has yet to meet their new arrival, who was born in June
. But she has seen pictures of her. "She is beautiful!"
Now that everyone has seen a photo of their baby girl – the new parents released a personal image
in late August – the trio "been spending time together as a family since," a close family source tells PEOPLE.