Rolf Harris crouched on all fours and barked like a dog before groping a teenage waitress, a London court has heard.

A woman who says she was molested by the entertainer when she was 13 or 14-years-old told a jury she was working as a waitress at 'It's A Celebrity Knockout' when she was asked to investigate a "barking dog noise".

The woman, who is 52 and cannot be named, said she went outside at the event - held in Cambridge in 1975 - and saw Harris on all fours barking at a dog. She said she was "slightly awestruck" to see Harris and he came up to her and put "his left hand on my left shoulder".

The witness said "I couldn't believe what was going on, this famous person was putting his arm around me. I was nervous then he moved and went up and down my back, over my bottom. It happened quite a few times. It was uncomfortable".

"I was too young to understand. It was like groping. Very firm. He squeezed it a few times". The woman added "I was completely frozen. I knew it was wrong. I didn't move. I was extremely embarrassed. He was not the slightest embarrassed".

She added she went to the police after the Savile revelations and after Harris' name emerged because "it happened to me and it would help back up someone else".

'He was carrying on as if nothing had happened'

Earlier, a woman told the court how she threw away a Rolf Harris autograph in disgust after he allegedly indecently assaulted her when she was a young girl.

Harris (84) is said to have touched the seven or eight-year-old girl's back, before running his "big, hairy" hand down her bottom and between her legs. The woman, now 52, was among dozens of children who had queued to get his autograph after he performed his hit song 'Two Little Boys'.

But she was left so shocked and scared after he touched her the she threw the piece of paper away after the incident at a community centre in Portsmouth, which she said happened in around 1969.

Speaking from behind a screen, the woman told jurors at Southwark Crown Court "It was so quick, I thought 'what's just happened?' More or less instantly his hand was back again. Straight up between my legs, aggressively, forcefully, as if it didn't matter if it was going to hurt me, I knew then it wasn't an accident".

The woman went on "I understood it was wrong. I wanted to get away. I wanted to scream out 'what are you doing?' but it wouldn't come out".

"He scared me. His eyes were fixed. He was carrying on as if nothing had happened" she said.

The woman said even now, years later, she still cried when she heard the song 'Two Little Boys'. She said she later told her husband and children that Harris was a ''dirty old man'' who had ''touched her up as a child".

Under cross-examination from Ms. Sonia Woodley QC, she denied suggestions that Harris had not been to the community centre and that she had not been indecently assaulted by him.

Harris is accused of indecently assaulting four girls and women between 1968 and 1986 and denies the 12 charges. The trial continues.