It's easy promoting sexy underwear if you are lucky enough to be the owner of some of the most famous curves on the planet.

Bootylicious Kim Kardashian has joined forces with sisters Khloe and Kourtney to promote their new lingerie line, Kardashian Kollection.

The trio pose in a series of sexy ensembles for their latest venture.

Kim, 31, sports a black lace bra and knickers while older sister Kourtney wears a similar nude and black set with matching hold-ups.

It is Khloe who steals the show with a black basque and stockings.

Meanwhile, Kim later tweeted a picture of herself on a bed wearing just a pair of tiny pink silk shorts and a sheet to protect her modesty with the provocative caption "Can't sleep tonight ..."

Kim Kardashian, Khloe and Kourtney
Kim Kardashian, Khloe and Kourtney spiced things up in a series of sexy ensembles.