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"Thank you God for blessing me with such wonderful children," the royal wrote on Instagram
On Friday morning, Monaco's princess posted three photos on Instagram of twins Prince Jacques and Princess Gabriella's late-night festivities, which included cake and decorations.
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"Happy birthday my babies," she wrote. "Thank you God for blessing me with such wonderful children. I'm truly blessed. Love mom.❤️"
The 43-year-old royal, who is currently receiving treatment outside of Monaco after suffering profound "exhaustion, both emotional and physical," according to her husband Prince Albert, did not attend the celebration.
Friday's Instagram post is her first public communication since she last shared a post three weeks ago, which followed her dramatic withdrawal from public view.
Princess Charlene of Monaco
| Credit: Stephane Cardinale - Corbis/Corbis via Getty Images
The photos show a "countdown party" at midnight (a birthday tradition for the family of four) in Monaco's palace. The royal twins are in matching pajamas with a mille-feuilles ("a thousand pastry leaves") cake shaped like the number 7, as "Joyeux Anniversaire (Happy Birthday) Prince Jacques Princess Gabriella" is displayed in icing.
Banners, balloons and a hint of a Christmas tree are also on display in the festive photos taken at the family's residence.
Princess Charlene returned to Monaco in mid-November after being "grounded" in South Africa for six months over medical issues and several surgeries.
Just days after, however, a joint statement from the palace announced the princess was experiencing "profound general fatigue," which forced her to withdraw from public activities, including Monaco's traditional National Day ceremonies.
Prince Albert II of Monaco, Prince Jacques of Monaco, Princess Gabriella of Monaco and Princess Charlene of Monaco
Credit: SC Pool - Corbis/Getty Images
Earlier this week, speaking exclusively to PEOPLE, Prince Albert said that an in-person visit with the children remained his family's priority.
"It's what we most hope for most," he said.
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