They're conquering the world!

Kim Kardashian and her sister Kourtney were in London to promote the U.K. launch of their Kardashian Kollection clothing line (Khloe didn't make the trip due to her "X Factor" hosting duties).

Kim was red hot in a body conscious mini dress with a sexy keyhole detail from the collection (the black version is on sale on their U.S. website). The previous evening, the reality starlet-turned-entrepreneur donned a sparkly sequined LBD for an appearance at department store Dorothy Perkins.

Kim was excited about the overseas extension of the line, tweeting this photo of the giant Kardashian Kollection billboard with the caption, "we're taking over."

They certainly are! There are some projections that the line -- which is figure-friendly to a range of sizes -- may outsell Kate Moss' popular Top Shop line in London. Check out all the photos above.

Hot Videos