"I really believe in him and think he's a good person, and I'm concerned about his health, his family, and I just hope that by some miracle he's set free," Anderson said.
Earlier this month, Assange admitted he was "a bit pale" after living for four years without sunlight.
Anderson brought Assange "a nice vegan lunch and some vegan snacks," she said.
"He said I tortured him with bringing him vegan food," she joked.
Assange has been living inside the embassy in London since being granted political asylum by Ecuador; he is accused of rape and sexual assault in Sweden, charges which he denies and says are a ruse organized by Washington to hand him over to the United States, where he is wanted for leaking thousands of top-secret military documents.
WikiLeaks marked its 10-year anniversary this year. Since 2006, it has published over 10 million documents.