Actor Rebel Wilson has apologised for tweeting a photo of a woman, along with the words "total scum", after she mistakenly accused her of harassing her grandmother.

The Bridesmaids star had posted a photo of Australian journalist Elizabeth Wilson to her 2.43 million followers, who she accused of repeatedly contacting her grandmother.But it appears she got the wrong Elizabeth Wilson.

But it appeared the damage has already been done, with Twitter users shaming the actress for her mistake.

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"It's the wrong person & completely unfair. Ur grandmother wasnt harassed by this Liz," Katlyn Macdonald posted.

Kayla Gex agreed: "@RebelWilson you have the wrong person. this is so sad. 2 million people have seen her face now and she is such an innocent soul. She is the loveliest person I know."

- AAP