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Amber Tamblyn is officially one proud mama!

The Sisterhood of the Traveling Pants star has welcomed a baby girl with husband David Cross. The couple's newest bundle of joy is both Amber and David's first child. She shared the news on her Instagram page.

One person who's probably especially excited for the arrival of Baby Cross is Amber's BFF and former co-star, Blake Lively. When the 33-year-old first shared she was expecting in late October, fellow new mom Blake expressed her well wishes with an extra precious shot of herself rubbing Amber's baby belly

Since then it's been nothing but go, go, go for Amber, who has spent the past few months continuing her political activism work and prepping for their daughter's entrance into the world. 

Amber announced her pregnancy with an essay for Glamour magazine, in which she touched upon her passion for women's rights. "I've been thinking about motherhood a lot lately. What it means to be one, what it means to have one, what it means to know one, what it means to make decisions as one and have conversations as one," she wrote. 

She continued, "Motherhood has been heavily on my mind because I am going to be a mother soon. I'm pregnant, with a daughter on the way. I think constantly about the world I am bringing her into."

The comedic actor tied the knot with her comedian beau, 52, in 2012. 

Congratulations, you two!