Kendall Jenner was just another professional fashion model back stage at the Marc Jacobs show during New York Fashion week on Thursday. No one knew who she was. It really wasn’t until her sisters spread the news later in the day via social media that anyone even knew the Keeping Up With the Kardashians star was in the show.

“Kendall was unrecognizable. No one backstage knew who she was,” an source told FOX411. “The photographers and backstage press ignored her.”

The 18-year-old bared her chest as she walked the runway, wearing a see-through long sleeve v-neck sweater sans her bra.

Kendall was apparently “relieved that no one recognized her. She liked the fact that nobody could tell it was her.”

What a difference a celebrity makes. When Paris Hilton walked the runway a few years back during New York Fashion week she was all about promoting her presence.

“Kendall didn’t seem to want the attention,” the source added. “Back when Paris Hilton did runway back in 2000, 2001, that’s all she cared about–people fawning over her backstage. Kendall was the opposite–a pro.”

The makeup artists did a great job of creating a totally new look for Kendall Jenner. Her dark eyebrows were covered with light makeup which made them all but disappear. A wig concealed her long locks.

Sister Khloe Kardashian couldn’t conceal her pride in Kendall and excitement over the experience she had.

My baby sister killed it today walking in the Marc Jacobs fashion show!!! Kenny you are so dope to… http://t.co/1edhqEi6fo

— Khloé (@khloekardashian) February 14, 2014

Kim Kardashian chimed in about her baby sister’s success as well.

Proudest sister ever!!!! @kendalljenner I love watching you live your dream! #MarcJacobs #NYFW http://t.co/LxdocQ4mbQ

— Kim Kardashian (@KimKardashian) February 14, 2014

A FOX411 source got word via the fashion industry rumor mill that Kendall Jenner was way more than just a celebrity face at the Marc Jacobs show.

“Some people would say that this was stunt casting by Marc Jacobs, but to me Kendall Jenner walking in Marc Jacobs absolutely legitimizes her as a model,” the source said. “She was sweet and unassuming. I don’t know if she walked the show on her own merits or because of who her family is, but if she got this on her own, that’s something to be proud of. For the models, they’re very excited to walk Marc Jacobs. It’s a big deal.”

This could mean the start of something big for Kendall Jenner–something that could take her away from the Keeping Up With the Kardashians lifestyle and into something really promising that is one hundred percent her own.

Image via YouTube