No wonder she's taking the fashion industry by storm!

Kendall Jenner joined the rest of her famous family to do some reality show taping at the studio in L.A. yesterday, and the cat walker put her pin thin gams on display in a short denim skirt, which she paired with a simple white cotton shirt and tan booties. If pregnant sister Kim Kardashian tried to wear this she would look downright ridiculous, but the Estee Lauder spokeswoman looked picture perfect!

If you believe the rumors, Kimmy K is envious of Kenny's hot bod, and has been criticizing her for being "too thin" out of jealousy! "No one can imagine how jealous she is of Kendall. She's always wanted that type of slender, tall, elegant body her younger half-sister has," a source tells New! magazine.

"When Kim saw Kendall's snap of her posing in a bikini by a pool, Kim got a little catty. She told Kendall she looks too thin and urged her to eat more protein and high-fat foods," the source adds.

Kim shouldn't be pissed at her younger sib just because she has to wear an overcoat everywhere she goes to hide her pregnancy weight gain!