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Blake Lively was amongst the estimated 400,000+ people who participated in the Women's March in New York City on Saturday.

Sister #2 located in NYC march! #womensmarchnyc

A post shared by Amber Tamblyn (@amberrosetamblyn) on

Lively, pictured above with (very pregnant) Sisterhood of the Traveling Pants costar Amber Tamblyn, was just one of the many stars who took to the streets to march in solidarity for women's rights.

Blake Lively uploaded this picture with a fellow marcher named Phoebe, who uses a wheelchair, to explain why she felt it was important to participate in the peaceful protest.

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I marched for my daughters, for my friends, for strangers, for myself, for Phoebe here in this picture who I met as she motivated everyone she came across. My march wasn't driven by hate. It was rooted in a very simple fact-- we are all equal. I believe everyone can agree on that. Thank you to everyone who marched all over the world. I felt so hopeful and deeply grateful. #whyimarch

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Celebrities popped up at many of the 600+ Women's Marches worldwide on Saturday, include Emma Watson, Chrissy Teigen, Amy Schumer, Madonna, Janelle Monáe, Whoopi Goldberg, Scarlett Johansson, Alicia Keys, Jake Gyllenhaal, Miley Cyris, Katy Perry, John Legend, Nick Offerman, Cher, Ian McKellen, Lin-Manuel Miranda, and Gillian Anderson, to name a few.