Who is Hailey Bieber's sister? Everything we know about Alaia Baldwin

At this point, many of us style enthusiasts make it a point to know as much about Hailey Bieber as we can—from her relationship with Justin Bieber to Hailey’s viral glazed nails—because when it comes to style and beauty, her word is ‘bible’ (as the Kardashians would say). She’s become one of the biggest models in the biz—but did you know she’s not the only model in the family? Hailey Bieber's sister, Alaia Baldwin has also strutted her stuff down the runway. Allow us to clue you up on Alaia and her relationship with her younger sis...

As many Hailey B fans will know, she was born into the world of Hollywood stardom, as her father is actor Stephen Baldwin, who you may know from films like The Usual Suspect and Threesome. Stephen is also the brother of Alec Baldwin—who stars in one of our favorite ‘coastal grandmother’ movies, It's Complicated.

But what some may not know is that Hailey also has an older sister called Alaia, who is also a model—and after Hailey spoke about her family in her interview on the Call Her Daddy Podcast—where she addressed the drama with Selena Gomez and Justin for the first time—you might now be curious about her sibling. So, here’s the lowdown on Alaia Baldwin...

Who is Hailey Bieber’s sister Alaia Baldwin?

Alaia Alene Baldwin Aronow is 29 and the oldest daughter of Stephen and Kennya Baldwin, making her Hailey’s older sister.

You might also recognize her and Hailey's cousin, Ireland Baldwin—who is Alec’s daughter—as they are all often pictured together.

Alaia is a model, represented by Squad Management. (opens in new tab) She has modeled for the likes of Porter, Harper’s Bazaar and Grazia magazines and has walked a number of runway shows.

Alaia is also a health and wellbeing advocate, especially around endometriosis—having been very candid and open about her own struggles with the condition. In fact, she’s on the Junior Board of the Endometriosis Foundation of America.

Alaia married her beau, Andrew Aronow, in 2017 after getting engaged in 2016—and can we just say, Alaia’s engagement rings are just as beautiful and MASSIVE as Hailey’s, look at this thing…

Alaia and Andrew then welcomed their first child together in 2020, a baby girl called Iris Elle who is Hailey’s first niece. Cute!

Hailey and Alaia's relationship

While Hailey is quite private with her personal family life, Hailey and Alaia have treated fans to a number of cute sister moments—like on Hailey’s 25th birthday when Alaia shared a tribute to her that read: “The strangest thing about you turning 25 is that… you’ve been 25 since you were 5. 😅 I’m so proud to see the woman that you have become. It has been incredible to watch you grow into your own."

“To see you become the perfect auntie is just the 🍒 on top. We love you more than you’ll ever know and I’ll always be your big sis💕”

Hailey was of course one of Alaia's bridesmaids and Alaia also posted this cute sibling moment from Hailey’s own engagement party…

Now, Hailey is embracing the aunty life, sharing pics of her and Justin cuddling Iris and marking her second birthday with an Instagram post that said: "There’s a little princess who had a birthday party today ✨."

While Hailey and Alaia don't speak about each other publically very often, it's pretty clear that they're close—especially when you spot that a few of Hailey's tattoos are a tribute to her sister! On her back, she has the words Coeur d'Alene inked in cursive, which translates to 'Heart of Alene'—Alene is Alaia's middle name.