The 20-year-old supermodel donned the label's sleeveless thigh-high slit dress and knee-high heeled sandals, while the Lip Kit entrepreneur, 18, looked stunning in black sleeveless jumpsuit and black pumps in the launch party, reported People magazine.
The fashion forward siblings celebrated their debut with momager Kris Jenner and brother-in-law Kanye West as well as best friend Hailey Baldwin and Gigi Hadid.
Also in attendance were Victoria's Secret stunners Martha Hunt, Devon Windsor and Josephine Skriver.
"We designed it according to what we love, and how our style is. It's someone who is really similar to us. A young girl wanting to have fun. That's mainly what we designed.
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