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A photo posted by Blake Lively (@blakelively) on

Blake Lively's and Amber Tamblyn are about to have plenty of playdates on their hands for their little ones!

Just yesterday, Tamblyn made the exciting announcement that she and husband David Cross are expecting their first child together, a baby girl, in the coming months.

And now her best friend Blake Lively is weighing in on social media, congratulating her fellow Sisterhood of the Traveling Pants star on the exciting family news.

"'I am asking you to rethink women, period. Go deep. See the frame that holds the big picture…' So proud of my dear friend, and new mama to be, @AmberRoseTamblyn," she wrote on Instagram alongside a side-by-side shot of Amber as a baby with her mother, and Blake hugging Amber and rubbing her baby bump.

"Whatever your beliefs, one thing is certain, the world must be a better, safer place for women and girls," Lively concluded.

Baby Cross is certainly going to have two BFFs as soon as she's welcomed to the world as Lively just welcomed her second child in late September. No word yet on whether The Shallows star gave birth to a boy or a girl.

Back in January of 2015, Lively gave birth to her first child with husband Ryan Reynolds, a baby girl they named James after his late father.

Congratulations once again to Tamblyn and Cross on their news!