Gigi Hadid and Bella Hadid don sexy ensembles for Bella's 21st birthday

Happy birthday Bella Hadid!

The model turned 21 on Monday, and she celebrated her milestone birthday in typically stunning fashion as she rocked revealing ensembles and surrounded herself with family and friends.

SEE ALSO: Robin Thicke's girlfriend April Love Geary flaunts baby bump in teeny bikini

On Monday night, Bella stepped out with sister Gigi, 22, and as they left her birthday dinner holding hands, they made jaws absolutely drop. Bella rocked a sexy satin LBD with lace-up sides and leather studded straps. She finished her look with strappy black heels and a high pony.

See their looks for Bella's 21st birthday in the gallery below:

9 PHOTOS
Gigi Hadid and Bella Hadid celebrate Bella's 21st birthday
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Gigi Hadid and Bella Hadid celebrate Bella's 21st birthday
NEW YORK, NY - OCTOBER 09: Gigi Hadid (L) and Bella Hadid are seen in Tribeca on October 9, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - OCTOBER 09: Bella Hadid and Yolanda Hadid seen on the streets of SoHo on October 9, 2017 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - OCTOBER 09: Gigi Hadid is seen in SoHo on October 9, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - OCTOBER 09: Gigi Hadid (L) and Bella Hadid are seen in Tribeca on October 9, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - OCTOBER 09: Bella Hadid seen on the streets of SoHo on October 9, 2017 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - OCTOBER 09: Bella Hadid seen on the streets of SoHo on October 9, 2017 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - OCTOBER 09: Gigi Hadid is seen in SoHo on October 9, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - OCTOBER 09: Bella Hadid and Yolanda Hadid seen on the streets of SoHo on October 9, 2017 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - OCTOBER 09: Gigi Hadid seen on the streets of Manhattan on October 9, 2017 in New York City. (Photo by James Devaney/GC Images)
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For her part, Gigi was a total vision in an all-baby-blue ensemble that put her fit physique on display. The model rocked high-waisted slacks with a super sheer, strapless corset top and, at one point in the night, she threw a matching blazer over her shoulders. She paired the look with matching satin heels and a simple updo.

Mother Yolanda Hadid, 53, went for a most restrained look, rocking a chic all-black outfit that she pulled off with aplomb.

SEE ALSO: Melanie Griffith flashes thong, Carmen Electra wows at Cinefashion event in LA

Earlier in the day, Bella turned even more heads when she shared a video on her Instagram Story that quickly showed herself rocking a simple t-shirt and a barely-there thong. The video was taken of a still photo on a DSLR camera, and it's unclear exactly when the initial photo was taken -- but it was still incredibly sexy nonetheless.

The racy snap isn't out of the ordinary for the new 21-year-old, who has never been shy about showing skin or flaunting her model physique. 

See the revealing picture she posted -- and more of her sexiest Instagram moments from 2017 -- in the gallery below:

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Bella Hadid's sexiest Instagrams of 2017
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Bella Hadid's sexiest Instagrams of 2017
Dinner...๐Ÿฏ๐Ÿ๐Ÿฝ๐Ÿ‘… @vogueitalia #CelebrationIssue with miss @taylor_hill shot by my brothers @mertalas @marcuspiggot @gb65 @patti_wilson Thank you for your artistic minds and allowing us to be free #realgirls #fakefood aka the food is all props and not real everyone
Off To Nowhere ๐Ÿคž๐Ÿผ
morning๐ŸŒบ
What a dream come true...This year felt like my first year all over again. Emotionally, physically, mentally, in my health I feel so much stronger in so many ways and I am so grateful to all who have supported me, believed in me and stood by me. Thank you for giving me this opportunity again sweet @ed_razek @monica.mitro @10magazine @johndavidpfeiffer Yesterday was so unreal on so many levels. It took so much for all of this to come together and truly as a team we pulled it together as a WHOLE. I am grateful. I am happy. I am humbled. And I just can't stop smiling thinking about it!!! I can't wait for you all to tune in to this show. #vsfs2017 . Also ... WAS IT NOT MEANT TO BE THAT MY WINGS ARE THE DAMN ๐Ÿฆ‹ EMOJI!?!?!!? Meant to be!!!!!! DREAM LOOK!!!!!! โค๏ธโค๏ธโค๏ธโค๏ธโค๏ธโค๏ธโค๏ธโค๏ธโค๏ธโค๏ธ๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹
Let's DO THIS!!!!!!!!!!!!โœจโœจโœจโœจโœจโœจโœจโœจโœจโœจ๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹๐Ÿ’ซ๐Ÿ’ซ๐Ÿ’ซ๐Ÿ’ซ๐Ÿ’ซ๐Ÿคž๐Ÿผ๐Ÿคž๐Ÿผ๐Ÿคž๐Ÿผโญ๏ธโญ๏ธโญ๏ธโญ๏ธ
Thankful, grateful and honored to be nominated for @britishfashioncouncil Model Of The Year alongside @adwoaaboah @gigihadid @kaiagerber @winnieharlow Even being nominated is such an honor, but being recognized for all of the work we put in this year makes it all worth it. I have been right beside these 4 hardworking, beautiful, smart, inspiring women this year watching the motivation, time and tears that goes into what we do. Thank you to everyone who made this wild ride of 2017 such a great work year. I am so proud of you girls, as well as ALL of the women/men in our industry that constantly put in so much love,effort, inspiration and hard work to be great! I could name 100 girls that deserve to win Model of The Year, so with that being said, I feel we are all winners. Thank you British Fashion Council for including me. (PS. Everyone needs a little Donna Summer in the morning๐Ÿ˜)
You are so talented! @revolvingstyle Majorrrrrโค๏ธโค๏ธ
(Credit: Instagram)
@dsectionmagazine cover supporting a special project with Terra dos Sonhos, a non-for-profit to fulfill the dreams of the young and elderly diagnosed with chronic illnesses shirts for donations on sale soon x spreading a message of love, inspiration, and hope in achieving your biggest goals, irrespective of circumstances, constraints and limitations. With and By my love @mertalas โค๏ธ
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ALEXANDER WANG fall 2017 campaign BY THE LEGEND JUERGEN TELLER ๐Ÿ–ค
Waking up this morning after the last day of new york fashion week
LOVEADVENT GETREADYโค๏ธ
Yes I made my @off____white purse strap into a belt....๐Ÿคฃ cc @virgilabloh @jenatkinhair @ninapark๐Ÿ˜œ shooting new @chromeheartsxbella eyewear today๐Ÿค“
ME&GUI FOR VOGUE๐Ÿ’œ
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Fight night
@victoriassecret I am so excited!..!!!!Thank you @monica.mitro @10magazine @johndavidpfeiffer and of course the wonderful, incredible @ed_razek + everyone on the team for making this dream come true again.. I feel so crazy humbled to get the opportunity to be a part of this show again...Walking into the offices this year i felt so happy, healthy, and honored.. I can't wait for another incredible experience!!! Congrats to all of the beautiful ladies I will be walking beside. I can't wait! Xx ๐Ÿ’•๐ŸŒธ
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Cover story @crfashionbook forever thankful @carineroitfeld and @mario_sorrenti โค๐Ÿ—ก
Opening night Cannes Film Festival ๐ŸŒธ My favorite carpet ๐Ÿ’“ @diormakeup @sabrinabmakeup @jennifer_yepez team โค๏ธ
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This was one of my favorite days ever ๐Ÿฆ‹๐Ÿฆ‹๐Ÿฆ‹ Happy birthday @lauren_perez I love you so very much. โคThank you for being you
Posted...๐Ÿ•Š๐ŸŒŠFirst job of the year and feeling so lucky...Love & Light to all of you๐Ÿ’™
where i belong๐Ÿ’™
goodnight๐ŸŒ™ love and light to you all..happy to be home๐Ÿ’›
Thank you @Dior for always making me feel like a princess ๐Ÿ‘ธ๐Ÿป๐Ÿ–ค #MariaGraziaChiuri
New RT X @nike !!!!! I ๐Ÿ–คYou!!! #TeamNike #NikeLab #Tisci So proud ! Thank you @riccardotisci17 ๐Ÿ’“๐Ÿ’“๐Ÿ’“
Last night at the sweetest and most humble @brandonmaxwell show. Thank you for having me and so many powerful women in your show!!! Thank you @georgecortina @jamespscully๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹
@mario_sorrenti for @vmagazine thank you Mario โค On stands march 9th ๐ŸŒ™๐Ÿ•Š
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The diamond serpenti @bulgariofficial ๐Ÿ˜๐Ÿ’Ž . u know how I love you @elizabethsulcer @alexandrevauthier ๐Ÿ’Ž๐Ÿ’Ž๐Ÿ’Ž๐Ÿ˜‡
Finally... Paris..! can't wait to be back with my Dior family... the most unreal @evaherzigova ๐ŸŒท๐Ÿ’‹
We're gonna have pins & posters too if you want them thanks to my creative genius @jessejostark โœ–๏ธโœ–๏ธ( fuck you baby tee ) @chromeheartsxbella @chromeheartsofficial @laurielynnstark
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Alexandre Vauthier by David Bellemere ๐Ÿ–ค
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I need you out in Jamaica relaaaxxin..๐Ÿ˜๐Ÿ˜
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Jst really happy to be here ๐Ÿค—โค๐Ÿ˜‡๐Ÿฆ‹
Today๐Ÿคž๐ŸผOff to La La Land @nike
Reflect and recharge ๐Ÿ“โค๏ธ๐Ÿ’
From my @portermagazine cover story by @terryrichardson @georgecortina in the Bahamas best crew thank you xxx๐ŸŒˆโค๏ธ
@portermagazine by @terryrichardson and @georgecortina @ladyrmason ๐Ÿ’™๐ŸŒˆ๐Ÿ™๐Ÿผsuch a fun week!๐ŸŽˆ
When doves cry..๐Ÿ’™๐Ÿฆ‹๐Ÿ•Š
I'm so lucky๐Ÿ˜‡๐Ÿ˜‡๐Ÿ˜‡๐Ÿ˜‡
Elle US cover story by Terry๐Ÿ•Š๐Ÿ‘ผ๐Ÿผ๐Ÿ’™
What a day๐Ÿ˜‡Eternal Sunshine
๐Ÿ•ŠElle US
@alexanderwangny giving itโค๏ธthank you for being my super date โค๏ธ๐Ÿ‘‘๐Ÿ’‹
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โœŒ๐Ÿฝ๐ŸŒบ โœŒ๐Ÿฝ
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Couple ladies on a boat ๐Ÿคค๐Ÿ’“๐ŸŒธ
She's finally here ๐ŸŒน
That kinda day ๐Ÿ•Šโค๏ธ
NIKE GIRL ! โค๏ธbehind the scenes.. THE OG sneaker ....Nike Cortez ๐Ÿ‘๐Ÿฝ๐Ÿ‘๐Ÿฝ๐Ÿ‘๐Ÿฝ #teamnike
AmFar ๐Ÿ•Š๐Ÿฅ‚๐Ÿ’ซ
Vogue Italia by IV โค๏ธNew @vogueitalia cover๐Ÿฆ‹By the most incredible, lovely, iconic @inezandvinoodh โค๏ธโค๏ธThank you @gb65 @pg_dmcasting @samuel_ellis @alexwhiteedits @efarneti Some of my favorite people to work with in the world. I appreciate you โค๏ธ Hair cut by @ward_hair makeup by @wendyrowe ๐ŸŒบ๐ŸŒบThank you
Landed in LA๐ŸŒž๐ŸŒž @DiorMakeup Dior Campaign Los Angeles launch today! #BellaFannyWorldTour continues ๐ŸŒบ๐Ÿคฃ๐Ÿ˜
#ad๐Ÿฆ‹Nike Nike Nike ! Back in la where I shot my Nike Beautiful x Cortez campaign by my girl @briannalcapozzi to launch in a few days ! @nikesportswear #teamnike #NikeGirl #45thAnniversaryOfCortez ๐Ÿ™๐Ÿผ๐Ÿ™๐Ÿผ๐Ÿ™๐ŸผLove
Tonight at my @diormakeup Pump n Volume Mascara Campaign Los Angeles Launch ! @diormakeup x @sephora @1maryphillips ๐Ÿ˜ @jenatkinhair ๐Ÿฆ‹ @LOSANGELES light ๐Ÿฅ‚
Tomorrow 9AM Grove Los Angeles to celebrate the NIKE CORTEZ and our campaign ๐Ÿ‘Ÿ๐Ÿ”Œ๐Ÿ’Ž๐Ÿ’™ @nikesportswear @nikelosangeles #Whatdreamsaremadeof ๐Ÿ˜‡
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