Ms Anderson was pictured arriving at Belmarsh prison where the Wikileaks founder is serving a 50 weeks sentence for breaching his bail conditions. Assange sought refuge in the Ecuadorian embassy in London while he was wanted over allegations of sexual offences, remaining there for seven years in an attempt to avoid arrest. Former Baywatch actress Anderson, who has denied dating the Australian but has admitted to being “very close to him”, arrived at the jail in south-east London with WikiLeaks editor Kristinn Hrafnsson.
The US actress met Assange on several occasions when he lived at the Ecuadorean embassy in London.
Assange was dragged out of the embassy last month and has been sentenced to 50 weeks in prison for a bail violation.
He is fighting extradition to the United States where he is wanted for questioning over the activities of WikiLeaks.
Mr Hrafnsson said Assange is in "general" solitary confinement because he mostly spends 23 hours a day in his cell, adding that the situation was "unacceptable".
Speaking after a court hearing last week, he said: "We are worried about Julian Assange. We are hearing that the situation in Belmarsh Prison is appalling because of austerity and cutbacks.
"For the last weeks since he was arrested, he has spent 23 out of 24 hours a day in his cell