Kendall and Kylie Jenner, as well as Joan and Erika Smalls.
Balmain released three of the photos yesterday on their Instagram , in each shot the sisters look ultra-glamorous, but GIgi and Bella's photo features an extra-sisterly act: Bella helping Gigi put on lipstick!
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What do you think of Bella and Gigi in the Balmain ad? Let us know in the comments section below!