Bella and Gigi Hadid are both models.
And they've both been known to pose in various states of undress.
But the new issue of British Vogue marks the first time Bella and Gigi posed nude together, and the internet is all sorts of confused about it.
On the one hand, you have two naked models, which is generally a good thing.
We're not sure if you were aware of this, but nudity is something that the internet is pretty fond of.
Typically, if you show the online world a pair of boobs, there will be a round of applause, and no one will ask any questions.
But the situation is complicated in this case.
Bella and Gigi are sisters, which makes the fact that they're all nude and intertwined like that a little gross.
The ladies shared the honor of cover girl, with two editions of the mag hitting newsstands - one with Gigi on the front, and one with Bella.
Inside the issue, the Hadids open up about their personal lives in a candid interview:
"She's one of the only people I'll get aggressive for. She makes me so proud. I would do anything for her," Gigi says.
Then Bella moved on to a topic that might actually interest readers - her relationship with Zayn Malik.
"I post what I think would be normal to post of your boyfriend," Bella said of her Instagram posts about Zayn.
"The comments are: 'It's extra, it's fake.' But if I don't do it enough then it's: 'Oh they're fake, they're not really together.' I try to do what feels real to me, and do it with integrity."
Needless to say, the interview was a pretty dull affair.
The opportunity to spice things up by asking Gigi and Bella how they feel about elevating their relationship to scissor sister status.
We guess we'll just chalk this sort of unsettling pic to differences in cultural norms.
There are lots of things that are kosher on the other side of the pond that simply don't fly here in the States.
Some of them are cool (universal healthcare) and some of them ... not so much (siblings wrapping their naked limbs around one another).
You're making us think, Brits! We don't like that in this part of the world!