Amber recently filed for divorce from Johnny Depp, 52, after 15 months of marriage and has alleged that he assaulted her numerous times during their marriage.
And her close friend claims Johnny left the actress with a "busted lip and clumps of hair on the floor" after one "all-out assault".
iO Tillett Wright, who called the police after Johnny allegedly attacked Amber last month, wrote an essay detailing the alleged abuse and claiming that it was an ongoing issue in their marriage.
In a post for
29, she wrote: "The reports of violence started with a kick on a private plane, then it was shoves and the occasional punch, until finally, in December, she described an all-out assault and she woke up with her pillow covered in blood. I know this because I went to their house.
"I saw the pillow with my own eyes. I saw the busted lip and the clumps of hair on the floor. I got the phone call immediately after it happened, her screaming and crying, a stoic woman reduced to sobs."
Amber has filed for divorce and was granted a temporary restraining order against her estranged husband last month. Johnny has denied the allegations of abuse.
- Bang! Showbiz