The actress reunited with Blake Lively, also of the Traveling Pants on-screen family, in the Big Apple, and the pair snapped another heartwarming selfie in front of an enormous crowd of impassioned activists.
"Sister #2 located in NYC march! #womensmarchnyc," Tamblyn wrote in the caption.
Tamblyn, Lively, Ferrera and Schumer were among hundreds of celebrities who took to the streets on Saturday -- alongside an estimated 2.9 million other protesters worldwide -- to stand for women's rights, human rights and political freedom. Check out the video below to see how some other big-name stars contributed to the historical, multi-city rally.