Lovato shared a selfie of the group on Instagram, and included the caption, "#wheresdemi #iseeyou." Kylie and Kendall Jenner later attended the E! Grammy Awards after party with half-sister Khloe Kardashian, who hosted the bash Sunday.
Kylie and Kendall Jenner announced they will design a new fashion line for Topshop last week.
The sisters previously launched clothing label Kendall & Kylie at PacSun stores, and released a special Valentine's Day collection for the brand Sunday.
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