"As Blake's friends and sisters for over twenty years, we stand with her in solidarity as she fights back against the reported campaign waged to destroy her reputation," the statement, shared on Instagram, read. "We are inspired by our sister's courage to stand up for herself and others."
In a complaint filed Friday, Lively and her legal team alleged Baldoni -- who also directed the Colleen Hoover adaptation -- coordinated a PR campaign with a crisis firm to "destroy" Lively's reputation after she took issue with on-set behavior.
The offending behavior allegedly included "improvised physical intimacy" during filming, inquiries about Lively's sex life with husband Ryan Reynolds, unwanted discussion of Baldoni's genitalia, and criticism of Lively's weight.
"We are struck by the reality that even if a woman is as strong, celebrated, and resourced as our friend Blake, she can face forceful retaliation for daring to ask for a safe working environment," Lively's "Sisterhood" co-stars wrote on Instagram.
Lively starred with Ferrera, Bledel, and Tamblyn in 2005's "The Sisterhood of the Traveling Pants," a coming-of-age drama based on the young adult book series by Ann Brashares. The film, which centers on a group of teen girls who share a pair of mysterious jeans, grossed $42 million worldwide and spawned a 2008 sequel.
Blake Lively takes legal action: Actress files complaint against 'It Ends with Us' co-star for sexual harassment
Lively and Baldoni's film "It Ends with Us" follows a flower shop owner named Lily Blossom Bloom (Lively), who falls in love with a dashing neurosurgeon named Ryle Kincaid (Baldoni) and reconnects with her stoic childhood sweetheart, Atlas Corrigan (Brandon Sklenar). The movie also grapples with the insidious nature of domestic violence and cycles of abuse across generations.
Lively's "Sisterhood of the Traveling Pants" co-stars lamented the actress's alleged experience of making the film, given its focus on gender-based violence.
All of Blake Lively's allegations: Unwanted kissing, smear tactics and more
"Throughout the filming of'It Ends with Us,' we saw her summon the courage to ask for a safe workplace for herself and colleagues on set and we are appalled to read the evidence of a premeditated and vindictive effort that ensued to discredit her voice," the actresses wrote in a joint statement on Instagram.
They added: "Most upsetting is the unabashed exploitation of domestic violence survivors' stories to silence a woman who asked for safety. The hypocrisy is astounding."
The "Sisterhood" stars' defense of Lively comes after Hoover voiced her support for the actress on social media Saturday. In a message posted to her Instagram Story, the author wrote: "@blakelively, you have been nothing but honest, kind, supportive and patient since the day we met. Thank you for being exactly the human that you are. Never change. Never wilt."
After filing her complaint against Baldoni, Lively reflected on her decision to take legal action in a statement to The New York Times published Saturday.
"I hope that my legal action helps pull back the curtain on these sinister retaliatory tactics to harm people who speak up about misconduct and helps protect others who may be targeted," Lively told the Times.
Blake Lively and Justin Baldoni feuded. Next came the smear campaign, she alleges.
In his own statement to The New York Times, an attorney representing Baldoni's production company, Bryan Freedman, described Lively's allegations as "completely false, outrageous and intentionally salacious with an intent to publicly hurt and rehash a narrative in the media."
Freedman maintained that Wayfarer Studios did not retaliate against Lively and "only responded to incoming media inquiries to ensure balanced and factual reporting and monitored social activity."
Contributing: Jay Stahl and Brendan Morrow, USA TODAY
This article originally appeared on USA TODAY: 'Sisterhood of the Traveling Pants' stars on Justin Baldoni complaint