The couple welcomed their first child together in September

Gigi Hadid and Zayn Malik are celebrating their first Halloween together as new parents — and sharing their first family photo with their newborn daughter!

On Saturday, the 25-year-old supermodel shared an adorable shot of herself posing beside Malik, 27, as the former One Direction member cradled their 1-month-old daughter in his arms.

Not sticking to any one theme, Hadid wore a blue bodysuit while channeling a video game character as Malik opted for a Harry Potter-themed costume. Meanwhile, the new parents dressed up their little bundle of joy up as the Incredible Hulk.

Their daughter, whose name has not yet been revealed, donned a Hulk knit hat and a green shirt, while her face was covered with a moving image of the comic book character.

Alongside the family snapshot, Hadid also added an animated sticker that sweetly read, "My First Halloween."

Mark Ruffalo, who portrayed the Hulk in the Marvel Cinematic Universe, noticed Hadid and Malik's daughter in her adorable costume. "Happy 1st Halloween to a fellow Strongest Avenger You look smashing!" he wrote in the comments section of PEOPLE's Instagram post featuring the family of three.

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Gigi Hadid Zayn Malik family
Gigi Hadid's Instagram Story
| Credit: Gigi Hadid/Instagram

Hadid also showed off her toned post-baby body in a skin-tight blue ensemble.

Sharing a series of photos of her Halloween costume on Instagram, the model captioned one series of snaps "choose your player 🕹🎃."

On his own Instagram Story, the crooner shared a shot of himself decked out in his wizarding gear. "Happy Halloween from slytherin," Malik wrote beside a snake emoji.

Gigi Hadid Halloween
Gigi Hadid
| Credit: Gigi Hadid/Instagram
Gigi Hadid
Gigi Hadid
| Credit: Gigi Hadid/Instagram
Zayn Malik Halloween
Zayn Malik
| Credit: Zayn Malik/Instagram

Hadid and Malik announced the birth of their daughter in September with a pair of black-and-white social media posts.

"Our baby girl is here, healthy & beautiful," Malik wrote on Twitter at the time. "To try put into words how i am feeling right now would be an impossible task."

The new dad continued, "The love i feel for this tiny human is beyond my understanding. Grateful to know her, proud to call her mine, & thankful for the life we will have together x."

gigi hadid zayn malik
Gigi Hadid and Zayn Malik
| Credit: gigi hadid/instagram

A day later, Hadid celebrated the exciting news with her own post, sharing a black-and-white photo of the infant's adorable tiny hand gently wrapped around one of Malik's fingers.

"Our girl joined us earth-side this weekend and she’s already changed our world. So in love🥺💕," she captioned her post.