The two actresses starred together for 10 seasons on the hit comedy series Friends as characters Rachel Green and Phoebe Buffay respectively, and have remained close ever since.
Taking to Instagram to mark the milestone, Aniston shared a slew of pictures of her and Kudrow from over the years, including one where she can be seen planting a kiss on a pouting Kudrow.
“Please join me in celebrating one of my favourite people on the planet. LISA KUDROW,” The Morning Show star wrote in the accompanying caption.
“She’s been my friend and my family for nearly 30 incredible years. I cherish you…I love you, my sweet Floosh.
“One of the most talented comedians/actors I’ve had the great honor to work with for all these glorious years and more to come!”
“Happy Lisa’s Birthday!” she concluded her post.
Clearly the feeling was mutual as Kudrow took to the comments section to thank Aniston for her well wishes.
“My Joooiest Joooo I love you beyond my dear friend forever!” she shared.
Their fans enjoyed the love fest, sharing several memes of their Friends characters together in the comments section.