Kendall Jenner is back where it all began in a bikini for Aussie label White Sands, even though she’s only 15. She vaulted to public attention in a bikini shoot last year.

Kendall and sister Kylie, who is 14, are trying to build their own brands just like step-sisters Kim, Kourtney and Khloe Kardashian.

Of course, bikini shoots like this raise all kinds of questions about age-appropriateness, but that doesn’t seem to faze the Kardashian juggernaut.

Kylie walked for Avril Lavigne’s fashion line at New York Fashion Week and made a mockery of the fashion industry’s new age standard.

Models are supposed to be at least 16 before they start humping the catwalks, according to an official policy recommendation by the Council of Fashion Designers of America (CDFA).

Check out Kendall’s photos; click to enlarge.

But Kendall is right on the edge of the demographic when most models hit the runway for the first time, anyway.

Valerija Sestic, an up and coming model who was everywhere on the New York Fashion Week catwalks, after apparently lying about her age. She is only 15, or 14, depending on the source of her birth date.

In Europe, some models are posing for adult fashion shoots at the tender age of 10.

Incidentally, Kendall also walked in New York Fashion Week.

Age aside, Kendall is definitely the Cinderella compared with the three wicked step-sisters of the Kardashian clan.

The photos were shot in Los Angeles in July, and Jenner is supposed to represent a whimsical water nymph. That’s nymph, not nympho! Big difference.

She’s repping for the brand’s spring/summer 2012 collection of floral bikinis, deep cut maillots and caftans.

“The collection has both an ethereal and strong side and we wanted a model that could capture both,” designer Leah Madden told People.

“As we were casting for the campaign we came across Kendall’s portfolio and loved her softness and strength. She actually made it to the top of our list before we knew her background!” he claimed.

Can he be arrested for this? Check out her hot photos.