Gigi and Bella Hadid Celebrate Brother Anwar's 18th Birthday -- See the Cute Pics!

Happy birthday, Anwar Hadid!

Gigi and Bella Hadid's younger brother turned 18 on Thursday, and the supermodels couldn't help but celebrate with tons of adorable pics on Instagram.

RELATED: Move Over Gigi and Bella! Little Brother Anwar Hadid Signs With IMG Models

"18 YEARS AGO MY LIFE WAS BLESSED W THE MOST SPECIAL AND AMAZING LITTLE BROTHER ON DA PLANET," Gigi captioned a cool black-and-white snap of herself and her baby bro. "@anwarhadid you amaze me more every year- watching you grow and thrive in exactly who you are makes me more proud than you'll ever know. You inspire me and so many around you, and I feel so lucky to be your blood! HAPPY BIRTHDAY love you foreva 🕊🕊✨🗻🛡🗡."

18 YEARS AGO MY LIFE WAS BLESSED W THE MOST SPECIAL AND AMAZING LITTLE BROTHER ON DA PLANET @anwarhadid you amaze me more every year- watching you grow and thrive in exactly who you are makes me more proud than you'll ever know. You inspire me and so many around you, and I feel so lucky to be your blood! HAPPY BIRTHDAY love you foreva 🕊🕊✨🗻🛡🗡

A post shared by Gigi Hadid (@gigihadid) on Jun 22, 2017 at 6:18am PDT

"ANWARCITO DAY 🎂 part II," the 21-year-old model captioned the cutest throwback photo.

ANWARCITO DAY 🎂 part II

A post shared by Gigi Hadid (@gigihadid) on Jun 22, 2017 at 7:28am PDT

RELATED: Gigi Hadid's Little Brother Anwar Hangs Out With 'Hot Mugshot Guy' Jeremy Meeks

Bella also shared a couple of childhood photos alongside a sweet message praising her little brother.

"Happy birthday my sweet angel. Your love and light is worth all of the stars in the sky! I'm so proud of the man you have become and are becoming. I'm so proud and lucky to call you my brother," she wrote. "Nobody loves you more than me my mini me 🦋 @anwarhadid 💙💙💙💙forever and ever and ever x infinity .. 18 years you're still my best friend and favorite man !"

Happy birthday my sweet angel. Your love and light is worth all of the stars in the sky! I'm so proud of the man you have become and are becoming. I'm so proud and lucky to call you my brother. Nobody loves you more than me my mini me 🦋 @anwarhadid 💙💙💙💙forever and ever and ever x infinity .. 18 years you're still my best friend and favorite man ! 🦋🦋🦋🦋🦋🦋🦋

A post shared by Bella Hadid (@bellahadid) on Jun 22, 2017 at 6:07am PDT

"❤️Happy 18th Birthday my sweet angel, thank you for all the light you bring into my life, you inspire me to be the higher me," Anwar's mom, Yolanda Hadid, shared alongside a baby photo. "Your kindness and consciousness is the greatest gift I treasure everyday so thank you for all that you do and all that you are to me and your sisters...... #loveYou #AlwaysAndForever #June22."

❤️Happy 18th Birthday my sweet angel, thank you for all the light you bring into my life, you inspire me to be the higher me. Your kindness and consciousness is the greatest gift I treasure everyday so thank you for all that you do and all that you are to me and your sisters...... #loveYou #AlwaysAndForever #June22

A post shared by YOLANDA (@yolanda.hadid) on Jun 22, 2017 at 12:36am PDT

RELATED: New Couple Alert: Anwar Hadid Is Dating Nicola Peltz

Anwar's girlfriend, Nicola Peltz, meanwhile, posted a much steamer snap of her boyfriend in bed.

"Happy birthday angel ❤️👼🏻❤️ i love you," the 22-year-old model-actress captioned the shot, before sharing a pic of herself in lingerie.

happy birthday angel ❤️👼🏻❤️ i love you

A post shared by Nicola Peltz (@nicolaannepeltz) on Jun 22, 2017 at 8:04am PDT

morning babies

A post shared by Nicola Peltz (@nicolaannepeltz) on Jun 22, 2017 at 8:44am PDT

RELATED: Anwar Hadid's Girlfriend Nicola Peltz Talks His Sisters Gigi and Bella: 'I Just Love His Family So Much'

Anwar and Peltz made their relationship public in January. See more on the pair's romance in the video below.