1. When Gigi co-hosted the AMAs and showed up to the red carpet looking like pure FIRE.
2. When Bella made army pants look couture.
3. Whenever Gigi and her boyfriend, Zayn, made an appearance together.
4. When Bella, not only walked in the Dior fashion show, but became their newest makeup ambassador.
5. When Gigi won the International Model of the Year Award at the British Fashion Awards.
6. When Bella and the Weeknd were too gorgeous and perfect together.
7. Whenever Gigi showed the world her adorable friendship with Kendall Jenner.
8. When Bella won "Model Of The Year" at the GQ Men of the Year Awards.
9. When Gigi designed a line of clothing with Tommy Hilfiger.
10. And, finally, when Gigi and Bella made history as the first sisters to walk together in the Victoria's Secret Fashion Show.
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