Actor Rebel Wilson’s defamation payout from publisher Bauer Media has been dramatically reduced from $4.5 million to $600,000.

The final figure is significantly less than the Pitch Perfect star had originally been awarded in damages in September last year, after she was defamed in a series of magazine articles.

The Court of Appeal handed down its 252-page judgement in Melbourne this morning.

An all-female jury ruled last June that that the Woman's Day, Australian Women's Weekly, OK! and NW magazine publisher defamed the 38 year old in eight articles published in May 2015.

Wilson took to Twitter last night to say she "had already won". (AAP) (AAP)

The articles claimed she lied about her real name, age and childhood in a bid to make it in Hollywood.

At the time the court heard Wilson was willing to settle for $200,000.

The initial payout of $4,567,000 made Australian history, with Supreme Court Justice John Dixon stating the amount was required to "vindicate" Wilson after her reputation as an "actress of integrity was wrongly damaged".

But the Court of Appeal's Justice Pamela Tate found there was no basis for her to be awarded financial damages for the potential loss of roles, setting aside the economic damages entirely.

Wilson's economic losses were also reduced from $650,000 to $600,000.

While the actor was not present for the judgment but she took to Twitter the night before, saying she had already won the case.

"I'm away on location in Europe filming right now," she tweeted on Wednesday night.

The actor outside Melbourne's Court of Appeal in April this year. (AAP) (AAP)

"As I've said before, I have already won the case and this is unchallenged!

"This case was never about the money for me."

Bauer Media did not challenge the jury's defamation finding in its appeal and sought only for the damages to be reduced.