Kourtney Kardashian and her sisters, Kim and Khloe are set to launch their new Lipsy Kollection fashion line in the UK on Thursday. The rumored pregnant reality TV star and her siblings stun in the new sexy campaign.

According to UK Glamour, the Kardashians have returned to fashion in a big way with their upcoming range with the British dress label, Lipsy.

The campaign marks Kim Kardashian's first post-baby modeling shoot since having North West in June. Shot by controversial fashion photographer Terry Richardson, the sisters donned very skin-tight, beautiful frocks and clothes from their exclusive 40-piece "kollection."

[For some of the hot new photos, click HERE.]

Kris Jenners' daughters each star in a series of group and solo shots, rocking gorgeous dresses and makeup looks. A newly blonde Kim flaunts her after-birth curves in a red-hot lace dress, and black figure-flattering frock with long sheer sleeves.

In one look, Kourtney Kardashian rocks a sleeveless leopard-printed blouse and skin-tight black short skirt. Her dark hair falls in loose waves down her shoulders.

And Khloe Kardashian shows off her more slimmer, thinner body in a short black dress with lace sleeves in one photo.

Kylie and Kendall Jenner's older sisters have created a high fashion line that comes with more expensive price tags than their previous clothing collections. The key pieces, ranging from $45.36 to $226.81, are sequinned bike jackets, lace jumpsuits and leather coats, reported Women's Wear Daily in July.

Their latest range will feature the same on-trend and sassy style that the ladies are known for, but it will differ in a significant way.

"[This new range will be markedly different because] the two customers are very different," said Bruno Schiavi, President of Jupi Corp who produces all Kardashian Klothing, "and we're taking it up a notch from where we launched."

Their line launches at Lipsy stores nationwide and Lipsy.co.uk on Thursday.

Buying one of the reality TV sisters pieces? Let us know in the comments section below!