Kim and Kourtney Kardashian launch "Kollection" clothing line in the U.K.

Kim and Kourtney Kardashian celebrated the U.K. launch of their clothing line -- Kardashian Kollection -- with a VIP party in London.

Kim, Kourtney and sister Khloe - who didn't attend the Thursday evening event because she's busy co-hosting the U.S. version of "The X Factor" - have teamed up with British clothing store Dorothy Perkins, which will stock the line.

At the launch, Kim Kardashian expressed hopes of one day opening their own store in London, saying "we would love to."

Kourtney added "we've been talking about it."

The Kardashian Kollection will be available immediately in more than 200 Dorothy Perkins stores in the U.K. It will also be sold internationally to 11 other countries in the Middle East and Asia.

In the U.S., the sisters' Kollection clothing line can be found at Sears. The reality TV sisters also sell their K-Dash by Kardashian collection on QVC, and have a nail polish line produced by Nicole by OPI, called Kardashian Kolor, with shades inspired by them, mom Kris Jenner and half-sisters Kendall and Kylie Jenner.