Gigi and Bella Hadid are showing love for their mother, Yolanda Hadid, on her special day.

The former Real Housewives of Beverly Hills star turned 53 years old on Wednesday, and both of her daughters took to Instagram to celebrate with adorable childhood throwback pics.

"To the most compassionate, supportive, loving, intelligent, creative SUPERmom in the world... I am so lucky to have someone like you to look up to," Gigi, 21, wrote. "Thank you for everything (especially @bellahadid & @anwarhadid), I love you so much! Happy Birthday!!!"

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"Today marks the day that our beautiful angel, my best friend and mother was brought into this word!" Bella, 20, also wrote. "Thank you for EVERYTHING!!!!!! Nobody loves you more than me! Happy birthday sweet mama."

And Bella's currently making us all jealous thanks to her amazing bikini shot on Tuesday, posing on a sunny beach despite the winter season.

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Of course, Yolanda is a super proud mother to her model daughters, as well as her 17-year-old son, Anwar, who's also a model. ET spoke with her in November at the Victoria's Secret Fashion Show in Paris, France, where she gushed about both Gigi and Bella walking the runway together.

"I'm just so proud, and grateful that we get the opportunity as a family to experience this in this moment in time," Yolanda told ET. "I'm just -- it's amazing. I'm just as fascinated as everybody else."

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