Who is Hailey Bieber's sister? Everything you need to know about Alaia Baldwin—from her career to her relationship sitch

Curious about Hailey Bieber's sister? While you're probably well aware of her famous pop star husband, Justin Bieber and likely her actor father—her big sis, Alaia Baldwin might not yet have crossed your radar...

As mentioned, the model and Rhode founder was born into the world of Hollywood, as her father is actor Stephen Baldwin, who you may know from films like The Usual Suspect and Threesome. This also makes Alec Baldwin—who stars in one of our fave ‘coastal grandmother’ movies, It's Complicated—her uncle. But aside from her movie connections, she also has another family member in the modeling biz.

Yes, it turns out her older sis, Alaia is a model in her own right and you might indeed recognise her from a few cameos on Hailey's IG feed too. So, here's everything we know about the Baldwin sisters, from their sibling relationship to Alaia's career and relationship status...

Who is Hailey Bieber’s sister Alaia Baldwin?

Alaia Alene Baldwin Aronow is 30 and the oldest daughter of Stephen and Kennya Baldwin, making her, you guessed it, Hailey Bieber’s older sister.

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

Alaia is also a model (like Hailey), represented by Squad Management. 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.

Relationship-wise, Alaia is married. She tied the knot with her beau, Andrew Aronow, in 2017 after getting engaged in 2016—and can we just say, Alaia’s engagement ring is 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

Hailey and Alaia have treated fans to a number of cute sister moments—like on Hailey’s 25th birthday back in 2021, 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 also, of course, one of Alaia's bridesmaids and Alaia also posted this cute sibling moment from Hailey’s own engagement party…

Hailey is now 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 one of Hailey's tattoos is 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.

We're now officially manifesting an Alaia cameo on Hailey Bieber's YouTube channel, as we've already had a cooking video with her mom and grandmother!