Are Kylie and Kendall Jenner Too Young to Model Sexy Bikinis?

In typical American families, parents display photos of their teenagers — innocent yearbook shots and department store portraits — on the mantel of along the stairway wall.

OK! NEWS: KENDALL JENNER TURNS 16 WITH A RANGE ROVER  BIRTHDAY SURPRISE

But there's nothing typical about the Kardashians: Matriarch "momager" Kris Jenner is drawing fire for allowing Kendall, 16, and Kylie, 14 — her daughters with second husband Bruce — to be photographed in precociously sexy attire.

Do a Google image search and you'll find pages of bare skin, such as in Kendall's erotically-charged swimwear spreads for the Australian brand White Sands, and Flavor, a Parisian magazine that, uh, has nothing to do with recipes.

"Kris totally encourages it," an insider tells OK!. "She's proud that Kendall and Kylie are so sexy."

Big sister Kim — who, after all, first earned fame in a sex video made with ex-beau Ray J — is proud, too.

"Kim sees nothing wrong with it," the source tells OK! "She actually took them for their first bikini wax when Kendall was 14 and Kylie was only 12!"

OK! NEWS: KENDALL AND KYLIE JENNER COVER TEEN VOGUE WITH KARDASHIAN SUPPORT

But not everyone is on board.

"Khloe and Kourtney are starting to think it's over the top," the insider reveals. "But Bruce is the most concerned, It makes him cringe."

FOR MORE ON KYLIE AND KENDALL JENNER'S MODELING, PICK UP THE NEW ISSUE OF OK!, ON SALE NOW!