Justin Baldoni suffered a massive blow in his legal war with Blake Lively and Ryan Reynolds.

The “It Ends With Us” director’s $400 million defamation countersuit against the couple was formally ended by Judge Lewis Liman after Baldoni, 41, missed the deadline to file an amended complaint, according to court documents obtained by The Post.

Judge Liman reportedly signed a new order on Friday that stated Baldoni and his Wayfarer Studios co-plaintiffs let the deadline lapse after their case was dismissed back in June.

In addition, Judge Liman reportedly said he contacted all parties involved in the case on Oct. 17 to warn them that he’s entering a final judgement to end the case.

Lively, 38, was allegedly the only person to respond. She asked the judge to declare the final decision and f

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