Kim, Kourtney and sister Khloe who didn't attend the Thursday evening event because she's busy filming 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.