The Hadid sisters have been pretty darn busy at NYFW.
From walking the runway for Brandon Maxwell, Bottega Veneta and Jeremy Scott to Prabal Gurung and Jason Wu, combined the famous sisters have hit the catwalk for some of NYFW's most talked about AW18 presentations.
However, we're surprised to learn the pair have a secret trick in their arsenal when it comes to walking down the catwalk together.
Before the pair opened and closed Anna Sui's AW18 show at NYFW on Monday, Gigi broke down her and Bella's runway routines, revealing they were given some 'homework' from the designer ahead of the show.
'Anna's done something really fun this season and gave us some homework of [watching] some old-school runway shows and how they used to walk and carry themselves,' Gigi told .
'So, Bella and I are opening together today, and we kind of had to do a little practice, a little homework and some extra rehearsals, but it's really fun to do something new and kind of challenge ourselves in that way.'
With the runway designed in an H-shape, the duo were seen walking down the parallel sides of the catwalk, back towards the middle, cross each other and then walk down the opposite side in unison.
Wearing a melange of textures including brocade, tweed and sequins for the show, Gigi later revealed her and her 21-year-old sister had their walks down to a tee thanks to one helpful sisterly model trick they've learned over the years.
'We work well together,' the Californian beauty said of Bella. 'We're good at timing each other on the same steps and stuff, so it's good.'
So, that's how the pair look so in sync on the catwalk - they count each other's steps.
The revelation comes two years after the Tommy Hilfiger collaborator admitted she's not a natural when it comes to walking the runway.
In a 'Screen Test' video for W magazine, the 22-year-old admitted she struggles with her walk.
'It's funny because obviously I'm not the best on the runway. Okay everyone we did it! Gigi said it; I know it! But… what do you do?' she laughed.
'I never was taught how to walk on the runway and maybe that's because it moved really quickly for me that people just assumed that was something I knew. I'm working on it.'
Well, from the looks of things, Gigi and Bella have officially nailed their runway technique.