Amber Heard's sister today passionately backed her sibling on the stand and said Johnny Depp repeatedly attacked her - including on one occasion when she saw the actor grab her by the hair and hit her in the face.

Whitney Henriquez said she witnessed the so-called 'stairs incident' in March 2015 and described how a drunken Depp nearly pushed her down the stairs at the couple's penthouse apartment in Los Angeles when she intervened in an argument.

Mr Henriquez claimed he struck her on the arm while at the top of a staircase, causing Heard to say 'don't hit my sister' and hit him back.

She said Depp then 'really went for Amber', adding that she was 'standing right there next to them when Johnny grabbed her by the hair with one hand and I saw him punch her really hard in the head'. 

In a wide-ranging testimony, the sister said Depp would insult Heard and say he loved her in the same sentence 'with equal amounts of passion', telling her: 'F***ing ugly c**t, you fat w***e… but God I f***ing love you'.

Among her other claims heard at the High Court in London today during Depp's sensational libel trial were that:

• She was 'shocked' at how to write a letter to a friend much weight Heard had lost and that she had been suffering from anxiety attacks;
• Depp's assistant Nathan Holmes was so desperate to get him on set that he 'even took Johnny's drugs';
• Depp accused her of leaking and selling stories to the media about the couple to her People journalist friend;
• She was described as their 'marriage counsellor' while living in one of five penthouses owned by Depp in LA;
• Depp did not like Heard working and said the actress would not take the credit card he wanted to give her;
• She 'begged' Heard not to marry Depp, saying him putting a ring on her 'was not going to stop him hitting her'.

The hotel banquet manager was living with the couple in Los Angeles in March 2013 when Depp began arguing with Heard after the actress claimed he had been cheating on her with a woman called Rochelle Hathaway.

She claimed that Depp was drinking whisky in the kitchen with an almost empty bottle in one hand, even though his 'sobriety nurse' Debbie Lloyd was also there, and he was swearing about Heard but 'not making much sense'.

Heard came in and was on the mezzanine level allegedly screaming 'f*** you' at him while Depp was on the ground floor, also screaming verbal abuse, saying she was a 'w***e' and 'an ugly old c**t', according to Ms Henriquez.

Amber Heard's sister Whitney Henriquez (left) and Heard (right) are both pictured arriving at London's High Court today

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