Meet the OTHER Hadid sisters! Bella is joined by Marielle and Alana at denim launch

After a series of modeling contracts and high profile relationships, she and sister Gigi have now become household names.

But on Thursday Bella Hadid was spotted with older sisters Marielle and Alana who supported her at the official launch party for the new ads for Joe's Jeans.

The 19-year-old is fronting the new denim campaign for the LA-based clothier, and had her sibling - who have the same father, but a different mother - by her side to celebrate.

We are family: Bella Hadid was supported by her older half-sisters Marielle (L) and Alana Hadid (R) at the launch of Joe's Jeans new ads on Thursday in West Hollywood

We are family: Bella Hadid was supported by her older half-sisters Marielle (L) and Alana Hadid (R) at the launch of Joe's Jeans new ads on Thursday in West Hollywood

Leading lady: The rising star is the face of the brand's new denim campaign and was the guest of honor at Thursday's soiree 

Leading lady: The rising star is the face of the brand's new denim campaign and was the guest of honor at Thursday's soiree 

Bella showed off her model figure in a pair of incredibly skinny black jeans coupled with a spaghetti strap top.

She accessorized the sleek look with a pair of very pointed toe pumps as well as a statement platinum choker.

The cover girl - who is dating Grammy winner The Weeknd - sported her hair in a sexy tousled look with loose waves tumbling over her shoulders.

Model look: Bella showed off her enviable figure in a pair of black skinny jeans rolled up at the bottom and a plunging black top

Model look: Bella showed off her enviable figure in a pair of black skinny jeans rolled up at the bottom and a plunging black top

Go back to black in Bella's ankle grazer jeans

Gigi Hadid might be the model of the moment, but little sis Bella is giving her serious competition!

Having already worked for the likes of Tom Ford, Diane von Fürstenberg and Tommy Hilfiger, the American model has started to bag some seriously stylish fashion campaigns -- the latest of which being for denim label Joe's Jeans.

Bella attended the launch party wearing the label's Vixen ankle grazer jeans, which features a higher rise to give your derrière a lift, and high spec fabric to hold you in and smooth your shape. Sounds good to us!

Bella's given her jeans a glam spin with a silky cami and heels, but why not try dressing them down for day with a simple T-shirt and baseball jacket?

Click right to snap up her exact style at Saks or check out the alternative options below. Jean-ius!

* PRICES MAY NOT BE AS ADVERTISED
Wasp-like waist: Bella drew attention to her incredibly narrow middle as she posed with her hands on her hips

Wasp-like waist: Bella drew attention to her incredibly narrow middle as she posed with her hands on her hips

Family reunion: Though Gigi was in New York City, the rest of her siblings looked happy to be spending time together on Thursday

Family reunion: Though Gigi was in New York City, the rest of her siblings looked happy to be spending time together on Thursday

Recently Bella put forth her own show of support for sister Alana, 30, as in February she and Gigi attended the presentation of the fashion designer's collaboration with Lou & Grey in New York City.

And on Thursday Alana looked sophisticated as she returned the favor, donning a fitted, black T-shirt along with skintight, white jeans and a pale pink trench.

Alana accessorized with a silver choker, and could be seen carrying one of her Lou & Grey clutches for the event, for which her blonde tresses were styled in soft curls. 

Coordinating: The genetically-blessed foursome all dressed in black tops for the soiree 

Coordinating: The genetically-blessed foursome all dressed in black tops for the soiree 

Was it something she said? Bella kept her most serious pose for the photo, but her younger brother Anwar had clearly heard something amusing as he burst into laughter  

Was it something she said? Bella kept her most serious pose for the photo, but her younger brother Anwar had clearly heard something amusing as he burst into laughter  

Sister love: Marielle (L) and Alana (R) showed off smiles as they posed beside a photograph of younger, half-sister Bella 

Sister love: Marielle (L) and Alana (R) showed off smiles as they posed beside a photograph of younger, half-sister Bella 

Marielle meanwhile flashed a bit of skin in a long-sleeved black top with a deeply plunging, lace-up front.

She coupled that with a pair of fitted, blue jeans, accessorized with a small, black leather belt, as well as a coordinating black leather handbag.

The doting mom wore her long, blonde tresses in a center part, and styled sleek and straight for the occasion.

It runs in the family! Alana and Marielle also showed off their fashion credentials at the event, with the former going sophisticated in a pale pink trench with white jeans, and the latter oozing sex appeal in a plunging, lace-up black top

It runs in the family! Alana and Marielle also showed off their fashion credentials at the event, with the former going sophisticated in a pale pink trench with white jeans, and the latter oozing sex appeal in a plunging, lace-up black top

Self-promotion: Alana showed off her designs as she carried a stylish, gold clutch from her collaboration with Lou & Grey, which was released just last month  

Self-promotion: Alana showed off her designs as she carried a stylish, gold clutch from her collaboration with Lou & Grey, which was released just last month  

Now for some entertainment: Bella and Marielle seemed amused as magician David Blaine stepped up to entertain the guests

Now for some entertainment: Bella and Marielle seemed amused as magician David Blaine stepped up to entertain the guests

And Bella's younger brother Anwar Hadid, 16, - who is also a model, having recently signed with IMG Models - was also there to support his older sister.

He looked laid-back in a torn, short-sleeved black T-shirt which he coupled with a pair of black jeans and a coordinating wristwatch with a black leather band. 

The young brood's parents Mohamed Hadid, Yolanda Foster (Anwar, Gigi, Bella), and Mary Butler (Alana, Marielle) were not present for the occasion. Gigi was also not photographed, though that was likely because the in-demand star was last pictured working in New York City.

Working his magic: The supermodel was hand selected as his glamorous assistant for the demonstration
Working his magic: The supermodel was hand selected as his glamorous assistant for the demonstration

Working his magic: The supermodel was hand selected as his glamorous assistant for the demonstration

Spell-binding stuff: The model and her family, as well as fellow guests such as male model Matthew Noszka who appears with Bella in the denim campaign, were captivated by David's card-trick talents

Spell-binding stuff: The model and her family, as well as fellow guests such as male model Matthew Noszka who appears with Bella in the denim campaign, were captivated by David's card-trick talents

No peeking: Bella was instructed to pick a card as her younger brother Anwar looked on

No peeking: Bella was instructed to pick a card as her younger brother Anwar looked on

The attending siblings looked happy to see each other, and could be seen cuddling together on a bench and smiling as they leaned in for pictures together. 

Bella was also pictured on Thursday with male model Matthew Noszka who appears with her in the denim campaign.

The six-feet, two-inch-tall hunk kept it simple in black jeans with dark gray suede shoes and a light gray t-shirt.

In good company: Bella was joined at the event by male model Matthew Noszka who appears with her in the Joe's Jeans campaign

In good company: Bella was joined at the event by male model Matthew Noszka who appears with her in the Joe's Jeans campaign

Seeing double: Fashion stylists and twins Chloe and Marie-Lou Bartoli chose all black ensembles that showed off their taut tummies and toned abs

Seeing double: Fashion stylists and twins Chloe and Marie-Lou Bartoli chose all black ensembles that showed off their taut tummies and toned abs

Working it: Actress Peyton List, 17, showed up in washed skinny jeans and chunky heels with a fringed long-sleeved top
Working it: Actress Peyton List, 17, showed up in washed skinny jeans and chunky heels with a fringed long-sleeved top

Working it: Actress Peyton List, 17, showed up in washed skinny jeans and chunky heels with a fringed long-sleeved top

Among the other guests at the shindig was Chloe Bartoli, the stylist and galpal of Scott Disick.

Photos of her and Scott canoodling on the French Riviera last summer were reportedly one of the reasons his longtime partner Kourtney Kardashian threw him out. 

Chloe's twin Marie-Lou Bartoli accompanied her to the party and the pair showed off their taut and toned midriffs in complementary black ensembles.

Teen Disney actress Peyton List also joined in the fun in blue jeans with a cream blouse with fringes and chunky cream heels. 

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