Kendall Jenner is walking some serious runways.

Jenner flew way under the radar in February at New York Fashion Week.

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

The 18-year-old reality starlet bared her chest when she walked the runway for the Marc Jacobs show. Sporting a short wig and severe makeup, Jenner walked the catwalk in a completely see-through long sleeve V-neck sweater, sans bra.

Our source said that backstage before the show, Jenner was "relieved that no on recognized her. She liked the fact that nobody could tell it was her."

"Kendall didn't seem to want the attention," the source continued. "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."

Jenner followed up her New York show with an even bigger one, walking the runway for Karl Lagerfeld in Paris this week.

This time she kept her chest under wraps in an oversized coat.

Our insider said in the fashion world, those shows are "a big deal."

"I don't know if she walked the (New York) 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."