Kim Kardashian's pillow rear

Apr 29, 2010, 12:05 GMT

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 mid-way 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 added: "These long days are killing me!!! LOL. (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?"

However, 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."