KIM Kardashian's bottom is like a portable "pillow".
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 midway through a launch party recently.
Writing on her blog, Khloe said: "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."
Khloe explained she was desperate for some rest because of all the work she'd been doing recently.
She said: "These long days are killing me! (sic) 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.
Referring to her behind, Kim said: "While I've been here a few people have asked if it's real, so you can grab it if you want."
Chrissie duly obliged and proclaimed: "It's juicy and real! It's like a water bomb."
Kim questioned: "Maybe a little too juicy?"
But 29-year-old Kim has claimed her backside isn't actually that large.
She said: "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."