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It was a Karadashian family affair at Friday's Givenchy runway show, but the night wasn't just huge for the queens of reality TV . The Sept. 11 event was a major night for creative director Riccardo Tisci, as it was the label's first-ever stateside showing at New York Fashion Week.

ET spoke with the iconic fashion designer after the runway show, where he was gushing about all of the love he felt in the room from stars like Nicki Minaj, Julia Roberts and, of course, Kim Kardashian.

WATCH: Kim Kardahsian Bares Baby Bump in Sheer Dress

Tisci famously designed Kardashian's wedding dress when she married Kanye West last year, and the two have become close friends. In fact, he personally selected the sheer black dress the 34-year-old pregnant mom wore on Friday.

Kardashian, who he described as "a very clever girl and sweet," decided with Tisci that she wanted to really go for it with the gothic look that put her growing belly on display. "She looked stunning!" Tisci said.

But why go for such a barely-there dress? "Pregnancy is so beautiful," he explained. "Why cover it? It's another message of love and life"

Kardashian turned up not just to support Tisci, but also because her little sister, Kendall Jenner, was walking in the show. The sister's support for each other is not surprising, but what is shocking is that Tisci had no idea that Jenner was part of the Kardashian clan at first!

The 41-year-old Italian initially picked Jenner to walk in the show after seeing her model during a visit to Paris. Between that and her photos, Tisci felt she had potential -- but he had no idea who she was. A day after working with Kardashian, the 34-year-old reality star told him, "You just picked my sister for your runway."

"I didn't know that was the sister of Kim, and I'm very close friends with Kim," Tisci admitted.

Luckily, they all know each other very well now. Not only has Jenner become a familiar face at Givenchy, Tisci continues to style the Kardashian crew. The real question now is, will Cailtyn Jenner get dressed by Tisci next?

Though she didn't make it to the show despite rumors of a possible appearance, Tisci said he is looking forward to the day he gets to work with the transgender woman he calls "a very big star and role model," saying, "that's going to be a moment."