Rolf Harris kissed an 11-year-old girl while she was off school through illness, a court has heard.

The alleged victim from Darwin said she was staying with friends and had met the entertainer once before when she claims he assaulted her in 1969.

The woman told a jury at Southwark Crown Court that she woke up and was wearing pyjamas when she went downstairs and saw Harris.

She said he had asked how old she was before telling her: "I want to be first person to introduce you to a tongue kiss."

Harris, 84, put his hands on her and ran them up the side of her body before kissing her and putting his tongue in her mouth, she told the court.

The woman said she felt "quite repulsed" and did not tell anyone what had happened.

School friends did not believe her when she later told them "my first tongue kiss was Rolf Harris," she said.

The witness said she had been married three times and had told her husbands she had a "hang-up" about tongue-kissing due to the incident.

She told the court she went to police after seeing media reports about an investigation into the TV presenter and artist.

Harris, 84, denies 12 counts of indecent assault allegedly carried out between 1968 and 1986.

The trial continues.