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Kim Kardashian's bottom is like a portable "pillow" says her kid sister Khloe Kardashian.

The US reality TV star, who is famous for her curvy derriere, lent her rear end to younger sister Khloe Kardashian when she needed a nap mid-way through a launch party recently.

"At one point I got really tired, so I had to take a nap on Kim's booty. It really does make the best pillow," said Khloe, writing on her blog.

Khloe explained she was desperate for some rest because of all the work she'd been doing recently.

"These long days are killing me!!! LOL. (sic)," she said.

Kim’s bottom was recently praised as being "like a water bomb".

The brunette beauty invited Australian talk show host Chrissie Swan to grab her rump in order to prove its authenticity live on television, prompting her to compare it to a soft, water-filled balloon.

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"While I've been here, a few people have asked if it's real, so you can grab it if you want," Kim said referring to her behind.

"It's juicy and real! It's like a water bomb," said Swan after taking a generous handfull.

"Maybe a little too juicy," replied Kim.

However, 29-year-old Kim has claimed her backside isn't actually that large.

"My butt is probably not as big as you might think, because I have small legs and a small waist, which makes it appear bigger," she said.