“Happy 17th birthday to my strong, sensitive, creative, loving, soulful, beautiful, talented, and wise Coco,” Cox, 56, wrote in the caption.
One photo shows Aniston holding up Coco as she puts her hands to her face and both smile at each other.
Last month, Lisa Kudrow made an appearance on an episode of Conan where she revealed to host Conan O’Brien that while filming Friends, her son, Julian, sometimes mistook Aniston for his mother.
“He’d fly into her lap,” Kudrow said of her son.
Aniston, Kudrow, and Cox all recently met up during the highly-anticipated Friends reunion special on HBO Max, along with Matt LeBlanc, Matthew Perry, and David Schwimmer.