The legal battle offers a glimpse of the feud between the co-stars of a box-office hit.

Justin Baldoni is taking legal action against his "It Ends With Us" co-star and her husband in a lawsuit he filed on Thursday.

Baldoni, in a lawsuit filed in New York federal court on Thursday, alleges extortion, defamation and claims related to breach of contract, among several others. He’s joined by his film studio, Wayfarer, and its chief executive Jamey Heath, and their public relations representatives, Melissa Nathan and Jennifer Abel. They seek at least $400 million.

Following Justin Baldoni’s whopping $400 million lawsuit, Blake Lively’s legal team has issued another scathing response. The two have been locked in a public battle for about a month now, and a private one since filming the romantic drama It Ends With Us.

Blake Lively has accused Justin Baldoni of employing manipulative tactics in his $400 million lawsuit against her and Ryan Reynolds.

LOS ANGELES (AP) — “It Ends With Us” actor and director Justin Baldoni has sued his co-star Blake Lively and her husband, “Deadpool” actor Ryan Reynolds, for defamation and extortion on Thursday in the latest move in a bitter legal battle surrounding the dark romantic drama.

Justin Baldoni mentioned Taylor Swift in his heated legal battle with "It Ends With Us" co-star Blake Lively. The actor claimed Lively pressured him using Swift's friendship.

Lively first revealed her allegations against Baldoni in an interview with the New York Times. The Times was subsequently sued by Baldoni, who accused the newspaper of promissory fraud and breach of implied-in-fact contract in his $250 million lawsuit.

From allegations of planting articles to concocting smear campaigns through text messages, Hollywood public relations has faced a messy few weeks.

Justin Baldoni released a series of alleged texts from Blake Lively to back up his claim she used her power to seize control of It Ends With Us from him, In Touch can report. In Touch obtained the alleged text messages that Justin, 40, submitted as part of his $400 million lawsuit against the Gossip...

The sighting comes amid claims she was was left 'perplexed' by Justin Baldoni 's supposed claim that Blake Lively enlisted her to 'pressure' him in his explosive new lawsuit.