Modeling is a family affair for Kim Kardashian's baby sisters Kendall and Kylie Jenner.

After Kendall, 14, raised eyebrows wearing a string bikini and other skimpy outfits in sultry pics posted last week, her younger sister Kylie's own debut recently hit the web.

On Tuesday, big sister Kim posted new modeling photos of Kylie, 12, on her blog. Unlike Kendall, Kylie stays covered up: in a new back-to-school ad campaign for Sears, she wears a less controversial outfit (dress, shirt, and booties).

"How cute does she look!?" Kim writes. "I am so proud of both Kendall and Kylie!! I think they are both figuring out what they’re interested in doing, and what they love to do, and have both had some amazing opportunities so far. I cannot wait to see what the future holds for them both!"

The youngest kids of Kris and Bruce Jenner, Kylie and Kendall are half-sisters to Kim, Khloe and Kourtney Kardashian.

Kendall's older half-sisters raved about her bikini shots. "I am speechless," Kourtney blogged. "I am so proud of you Kendall," Kim chimed in. "She's going to take over the modeling world."

But a recent poll on showed a more mixed reaction: 49% of readers argued that Kendall was too young to model in a bikini, versus 51% in favor of the photos.