The British director, who had a brief affair with the Twilight star, explained scenes in the film and raved Kristen's performance.
When the 22-year-old first appears as Snow White locked up in castle, Rupert says, "This is the first dialogue I shot with her, I said maybe you do a prayer. Her accent was flawless, she did such an amazing job on it."
He went on to say, "Kristen was amazing. I'd sit down with Kristen at lunch and say, "What do you think?"
In addition to talking up the actress, Rupert shares funny stories about what the cast would do off camera.
For instance, in a scene where Kristen makes out with Sam Clafin who plays William and is possessed by Charlize Theron's character Ravenna, Rupert tells the audience how the actors joked around and Charlize said, "I loved getting off with you" to Kristen even though they never shared a kiss.
In July, photos surfaced of Rupert who is married to Liberty Ross, kissing Kristen who was still dating longterm boyfriend Robert Pattinson causing a very public cheating scandal and heartache for everyone involved.
As a result, Kristen has moved out of the house she lived in with Rob and Liberty has been spotted out not wearing her wedding ring on several occasions.