Jennifer Garner celebrated 20 years of friendship with Judy Greer.

Taking to Instagram on Thursday, Garner, 51, shared a picture of herself with Greer, 48, and wrote: "Twenty years with my JG."

"I sure am proud to be your friend. Happy birthday, @missjudygreer," the Juno actress  added.

The two first met in 2004 on the sets of the age-swapping romantic comedy film 13 Going on 30. Since then, Garner and Greer have become close friends.

Earlier, in an interview with Insider, Greer talked about her first meeting with Garner and said: "Meeting her was a treat. Who can ever say enough about her? She's literally like what everyone says, like the greatest of all time."

"She was just a really great leader. She never complained. She was never late to work. She was professional, but she was also crazy fun and, obviously, so talented," she continued.

"When you have someone like that as No. 1 on the call sheet, you really can't complain about anything. Like, you're an a--h--- if you do," the Halloween Ends actress concluded.