Bergen, who played Sharon Myers in Book Club, shared a group photo on Instagram. The picture shows the actress and her co-stars smiling and holding cocktails.
"Reunion of the Book Clubbers!!! At Jane's gorgeous, perfect house. So good to be together," she captioned the post.
Steenburgen, who portrayed Carol Colby, posted a close-up of the same photo on her own account.
"Book Club Reunion at Jane's. Love them. So much!" she wrote, adding a heart emoji.
Book Club opened in theaters in May. The movie follows four friends (Fonda, Keaton, Bergen and Steenburgen) who read Fifty Shades of Grey as part of their book club and are inspired to change their personal relationships.
"It said a lot about friendship and about being my age, which is 65, and owning it and enjoying it and claiming that as a woman in every single way. I loved that," Steenburgen told Variety at the film's Los Angeles premiere.
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"It was honest and very real and true about women's friendships and the importance of women's friendships," Bergen added.
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