Meet Hailey Baldwin’s hot sister

In the ’90s, the Baldwin brothers — hotheaded Alec, slick Stephen (“The Usual Suspects”), addiction-plagued Daniel (“The Devil’s Dominoes”) and heartthrob Billy (“Flatliners”) — ruled Hollywood.

Today, it’s the Baldwin women making waves: Alec’s daughter Ireland has been modeling for a few years. Stephen’s daughter Hailey has graced the runways in both New York and Paris. And now her big sister, Alaia, is poised to shake up the fashion industry.

“We have our moments, too, and we will say, ‘We feel so Baldwin right now.’ ”

 - Alaia Baldwin

A 22-year-old model, she grew up bouncing between her dad’s movie sets — from Oregon to Italy — and the family home in Nyack, NY. (Her mom is Kennya, a graphic designer.)

“We went on all of the sets [for months at a time]. It ended up being boring sometimes because you are sitting in a trailer eating a Subway sandwich,” Alaia tells The Post. “The best set was [2000’s] ‘The Flintstones.’ ”

Now, though, she’s settled in her own apartment with soaring views of downtown Manhattan. The move was strategic, as Alaia prepares to make her debut on the runways at New York Fashion Week in February.

“This is an important one,” she says of landing high-profile shows. “I work well under pressure. I’m like, ‘Yeah, let’s go’ . . . Working for Calvin [Klein] would be sick. I love their undies.”

She originally signed with Major Model Management in 2013, but had to put her dreams on hold as she struggled with health issues. “I didn’t know what it was for a really long time, and then I discovered . . . I have food and gluten allergies that are really severe.”

In October, Alaia signed with State fashion management, and she has shot an ad campaign to be released in March.

Her sister, Hailey, 19, is already known for her work with labels like French Connection and Topshop — and for her romance with Justin Bieber.

“My family has known Justin for a long time. In my head, he is always 12 [years old],” Alaia says.

Unlike her paparazzi-favorite sibling, she doesn’t pal around with the Jenners or the Hadids, and she is in a low-key romance with a filmmaker, Andrew Aronow.

“With modeling, [Hailey and I] won’t be competitive because we look so different. And it’s nice to have someone to talk to about the industry.”

She also counts cousin Ireland as a confidante — about work and their family. “[She] is like my other sister. When we’re around our family, it’s Baldwin probs. We get it. We talk about it and laugh,” she says.

Last month, Alaia tweeted, “I’VE BEEN WAITING TO SEE THIS DOCTOR FOR TWO HOURS I’M ABOUT TO BLOW MY BRAINS OUT,” she tweeted. Then: “Cue Baldwin anger-management moment in 3 . . . 2 . . . 1 . . .”

Anger issues run in the family.

Her famously temperamental uncle Alec has launched dust-ups with the paparazzi, a flight attendant, countless Twitter users and even his own daughter Ireland — whom he called a “thoughtless little pig” when she was only 11.

“Oh yeah, Baldwin men definitely have their moments, some more extreme than others,” Alaia admits. “Even [my cousins and I], we have our moments, too, and we will say, ‘We feel so Baldwin right now.’ ”

Though the Baldwin brothers all share the same piercing blue eyes, her father’s outspoken religious beliefs — and his Republican politics — set him apart from his liberal brothers.

Alaia shares her father’s spirituality. “[My faith] is something I grew up with, but now is more my choice. My parents are both super chill and loving and not judgmental.”

After the 9/11 attacks, Stephen became a vocal born-again Christian. He’s set up various ministries, has campaigned for Republican candidates who share his beliefs, and made several faith-based movies — all moves he claims have cost him roles in ultraliberal Hollywood.

Alaia can identify in a way. She says the family name hasn’t been that helpful in her career.

“People think it’s more of a help than it is. Maybe acting would be different, but in modeling, nobody cares.”