The Phoebe Buffay actor turned 59 on Saturday and was celebrated by her pals on social media.
Posting a recent snap of them together, Courteney – best known as Monica Geller in the hit sitcom – used her affectionate nickname for Lisa.
“Happy Birthday loot,” she wrote. “You make everything better. And funnier!”
Jennifer – aka the show’s Rachel Green – shared a GIF of her and Lisa’s characters cheering, writing: “Happy birthday @lisakudrow. Ich liebe dich.”
She also shared a snap of herself kissing Lisa on the forehead.
She joked she took offense to Julian Stern’s “demeaning” reaction to the hit sitcom, which he first watched when he was at school.
During an appearance on Late Night With Seth Meyers, Lisa revealed he said: “It’s actually really funny and the guys are so funny.”
Lisa, whose character was arguably one of the show’s funniest, was left wounded by the backhanded compliment.
“He’s like, ‘No, I mean, you’re funny too,’ she continued. “And never in my life have I wanted to tell my own kid, ‘Fuck you.'”