"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.
WikiLeaks marked its 10-year anniversary this year. Since 2006, it has published over 10 million documents.