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Kendall Jenner photobombs Kim's booty selfie: How Kendall stays slim

Two's company, three's a crowd. And in the case of Kendall Jenner joining Kim Kardashian in a booty selfie, the "three" refers to Kendall, Kim and Kendall's perky posterior, which was posed so that it dominated the photo, reported Yahoo News on Jan. 11.

"Barging in on Kim's booty selfie," Kendall captioned her Instagram picture, in which the sisters flaunted their fabulous figures in workout wear.

An aspiring model at age 18, Kendall has joined Kim in her fondness for selfies. But Kendall hasn't had to deal with the accusations of photo-shopping that have infuriated Kim, who has devoted the past few months to her weight loss program.

"It sucks when people make up surgery or photoshop lies when I am so disciplined & work so hard!" Kim posted on Twitter on Jan. 10.

But while Kim is sticking to the Atkins diet, Kendall is contending with the opposite problem, according to Yahoo OMG.

"I'm constantly criticized for being too skinny," Kendall complained.

"I'm trying to gain weight but my body won't let it happen. What people don't understand is that calling someone too skinny is the same as calling someone too fat. It's not a nice feeling."

However, Kendall is careful about her diet. She doesn't believe in deprivation, but she uses portion control.

"Cupcakes. I definitely have a sweet tooth like Kim [Kardashian], but everything in moderation," Kendall told Celebuzz.

"There's nothing wrong with treating yourself to your favorite snack every now and then. Life's too short."