The Harry Potter star, who is taking a year off from acting to focus on feminism, joined First Lady of New York City Chirlane McCray Tuesday to turn the Empire State Building pink in honor of International Women's Day.
"Look outside your windows at dusk! @Chirlane and I just turned the Empire State Building PINK!" she tweeted while sharing a picture of the duo on the observation deck of the famed structure.
Her efforts haven't gone unnoticed, either. Harry Potter author J.K. Rowling took to Twitter to applaud Watson's work.
"Nice emoji!" Rowling tweeted, referencing the new HeForShe Twitter emojis that debuted today. "You're an inspirational woman."
Watson responded, "Right back at you. Thank you for everything."
Watson, 25, has been keeping busy on social media and in New York City Tuesday to mark the day.
In the morning, she chatted with Oscar-winning actor Forest Whitaker on behalf of HeforShe, her organization that encourages men to join the movement for gender equality. The group is sponsoring HeforShe Arts Week, in tandem with U.N. Women.
"You can't find peace if women, 50% of the population, aren't included in the conversation," Whitaker tweeted early Friday.
He later tweeted that he had a "wonderful conversation" with Watson about gender equality, while she tweeted a picture of the pair and wrote "what a kind man."
Watson's International Women's Day celebration comes in the wake of the reveal of her Esquire cover alongside Tom Hanks, her costar in The Circle, a thriller out later this year. Watson told the magazine she feels like her work supporting women "just feels like I'm really doing what I'm meant to be doing."
She also said she doesn't mind being labeled a "diva" or "difficult" for speaking out about the gender pay gap: "It's not going to stop me from trying to do the right thing and make sure that the right thing happens."
Watson revealed her decision to take a break from acting last month during a chat with noted feminist Bell Hooks in an interview that appeared in Paper magazine.
She also recently took part in a chat with famed feminist Gloria Steinem, revealing that she's even delving into the world of sexual equality with her "expensive" subscription to a website aimed at female pleasure.