Here’s what you need to know about why Taylor Swift is involved in the Blake Lively vs Justin Baldoni It Ends With Us case.

Justin Baldoni is heard apologizing to his co-star Blake Lively in an audio message apparently sent to Lively amid production of their film “It Ends with Us,” long before the two stars launched into a legal battle that continues to play out in the public eye.

Blake Lively's brother-in-law Bart Johnson says he regrets inserting himself into the conflict between the actress and her "It Ends With Us" co-star and director Justin Baldoni. Last month, Johnson, who is married to Lively's sister Robyn Lively,