Sitting outside at her mom Yolanda Hadid's , Gigi explained how she was able to keep her growing tum under wraps for so long.
Wearing a green and white top from Holiday by Emma Mulholland, the star left the shirt unbuttoned to help her cope in the summer heat.
She explained how sitting front on with the shirt loose down the bottom, you could not tell she was pregnant.
But when she turned to the side the bump was clearly visible, as she pulled the shirt open to show delighted fans her pregnant belly.
said excitedly: "I have been taking a lot of pictures of my bump and sending them to my friends and family, and it's been really cute and exciting I having been trying to document it because people are saying don't miss it."
The supermodel has remained private about her pregnancy and has not posted any photos of her growing bump on social media.
Promoting her Gigi Journal Part II with V Magazine, the supermodel explained she was keeping a low profile so as not to take attention away from the and Black Lives Matter movement.
She said: "Right now I just want to experience it and I write in my journal a lot and I just don't want to worry about waking up every day and look cute and post something.
"A lot of people are confused by why I am not sharing more but I am pregnant through a pandemic, obviously my pregnancy is not the most important thing going on in the world, that's in part why I didn't feel a need to share, apart from with my family and friends.
"Obviously a lot of people have lost lives due to coronavirus - that was in the beginning of quarantining and it's still happening - and then me moved into obviously the re-emergence of the BLM movement and I thought our presence on social media should be used for that."
Following rumors that she was expecting, Gigi in late April when she appeared on The Tonight Show Starring Jimmy Fallon.
She said: "Obviously, we wished we could have announced it on our own terms but we're very excited and happy and grateful for everyone's well wishes and support."
Back in May, Gigi admitted .
That means she is likely due to have her baby in the Fall.
She has been an expert at keeping he growing belly under wraps, including at a recent family picnic.
Her dad, property mogul Mohamed Hadid, shared a - Gigi, , 23 and Anwar Hadid, 21- spread out while sitting on blankets on a lawn.
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He expertly hid Gigi's bump with a
Anwar's pop star girlfriend , 24, and their friend Leah McCarthy, 25, also appeared in the photo, which was taken at Leah's birthday party.
Gigi hasn't let pregnancy slow her down and has kept busy while quarantining with her family.
Back in May, .
The sisters both wore face masks as they interacted with family friends that were also helping.