Phoebe Gates/Instagram Melinda French Gates and Phoebe Gates
Happy birthday, Melinda French Gates!
"Wishing the happiest birthday to the woman I look up to everyday," Jennifer, 26, wrote on her Instagram Story alongside a sweet photograph from her wedding, which took place last fall.
Phoebe, 19, also had sweet words for her mother.
"Happy birthday to the most incredible woman. To know you is to love you," the Stanford University student captioned a pair of throwback images.
"Reflecting on this day it's hard to fathom how blessed I am to call you both my mother and my person," she added.
Phoebe Gates/Instagram (2) Phoebe Gates and Melinda French Gates
Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
Earlier this month, Melinda and her youngest daughter got to spend some quality time together in London.
Documenting a fun-filled day, Phoebe shared a photograph of herself raising a glass at a restaurant along with the caption, "Swipe to see my cute date 😉✨💖." In the following slide, the teen revealed that her special dinner guest was her mother.
RELATED VIDEO: Bill and Melinda Gates' Daughter Jennifer Shares First Photos from Wedding to Nayel Nassar
In addition to enjoying each other's company, Phoebe hasn't been shy about sharing how much her mom's work inspires her.
"When you're Melinda's daughter, it's easy to be passionate about reproductive health. My mom is my hero," she wrote. "She's a brilliant reformer who travels around the world advocating for gender equality."
Phoebe went on to share that while she may be young, she's sure that "wherever" she ends up in life, she'll remain committed to the fight for women's rights.
"That, I hope, is the final legacy of Friday's decision: that it created a whole generation of pissed-off young people who will devote our lives to winning back a woman's right to choose," she wrote.