Blake Lively's sister Robyn Lively has shared her support for the actress amid her lawsuit against Justin Baldoni.

The 37-year-old actress has taken legal action against her 'It Ends With Us' co-star and director, accusing him of sexual harassment and launching a smear campaign against her, and her sister Robyn, 52, is relieved that Blake is "finally" getting "justice".

She posted a collage of collage of screenshots from a The New York Times article on the lawsuit and wrote: "FINALLY justice for my sister @BlakeLively."

She also shared a link to the same article, tagged her sister's Instagram handle and added an animated heart around it.

Blake has also received support from Colleen Hoover, author of 'It Ends With Us', who took to her Instagram Story to heap praise on the "honest, kind [and] supportive" star just hours after the lawsuit was made public.

Colleen shared a photo of herself and Blake hugging at a screening of the movie and, alongside a link to The New York Times' article on the situation, 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."

Blake submitted her 10-claim complaint with the California Civil Rights Department last week, in which she accused Baldoni, his production company Wayfarer Studios and others involved with making the movie of sexual harassment and a "coordinated effort to destroy her reputation".

The star claimed the film was shot amid a "hostile work environment that nearly derailed production" and alleged a campaign against her was launched by the actor - who also directed the movie - and his company after its release.

One of the demands mentioned in the lawsuit called for "no more adding of sex scenes ... outside the scope of the script BL approved when signing onto the project."

What's more, Blake demanded "no more showing nude videos or images of women to Blake, no more mention of Baldoni's alleged previous 'pornography addiction', no more discussions about sexual conquests in front of Blake and others, no further mentions of cast and crew's genitalia, no more inquiries about Blake's weight, and no further mention of Blake's dead father".

According to the lawsuit, Sony Pictures - the company responsible for distributing the film - approved the former 'Gossip Girl' star's requests. But the actress has alleged that Justin subsequently engaged in a "social manipulation" campaign in a bid to "destroy" her reputation.

The actor - who has been dropped by his talent agency, WME in the wake of the claims - has denied the allegations and accused her of making an attempts to "fix" her own "negative reputation".