The model will testify on behalf of her ex-boyfriend during the sixth and final week of his defamation trial.

Kate Mosswill be called to testify on behalf ofJohnny Deppduring his defamation trial against ex-wifeAmber Heard.

In the testimony, Heard insinuated that Depp once pushed Moss down a flight of stairs.

Johnny Depp and Kate Moss during “Don Juan De Marco” Beverly Hills Premiere at The Academy in Beverly Hills, California, United States.

Johnny Depp and Kate Moss circa the 1990s.Jim Smeal/Ron Galella Collection via Getty Images

I just instantly think of Kate Moss and the stairs, and I swung at him.

In all my relationships to date, I hadn’t [delivered] a blow.

For the first time, I hit him square in the face."

Moss did not testify in the U.K. libel lawsuit.

When Heard referenced Moss on the stand earlier this month, Depp’s attorneyBenjamin Chew looked pleasedabout the anecdote.

Legal experts have said that Heard’s reference allowed Depp’s team to address the rumors.