It has been reported that Kate Moss will testify at Johnny Depp's defamation trial against ex wife Amber Heard.The model, 48, whose daughter Lila was recently pictured wearing an insulin monitor in a stunning fashion campaign, will reportedly take the stand on Wednesday. It is thought she will be appearing via video link rather than attending the courtroom in Fairfax County, Virginia.The Pirates of the Caribbean actor is suing his ex wife after she wrote an op-ed in the Washington Post about experiencing domestic abuse. While she didn't name names, Depp launched a $50million libel lawsuit against her.