Model Liberty Ross described working with Kristen Stewart as “a dream” before finding out her husband had a fling with the young actress.

Ross gave an interview before photos emerged of Rupert Sanders in a steamy clinch with the 22-year-old in a car last week.

Ross, 33, played Kristen’s onscreen mum in "Snow White And The Huntsman," which Sanders directed.

Asked about what it was like working with Stewart, Ross – who has two children with Sanders - said: “So amazing, it was literally a dream. I couldn’t really believe it was happening.

“It’s all been amazing, really amazing.”

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At a movie premiere in May, she also described Stewart as "transfixing."

She said: "Kristen was my number one choice. I think there is no better Snow White in my opinion. She is great.

"I mean, I’ve never watched a 'Twilight' movie, so I don’t really know, but I loved her in Sean Penn’s film just for that moment that she’s in it.

"Ever since then — she’s got something very transfixing about her. We needed a modern, edgy, cool girl."

Sanders, 41, also previously admitted he was anxious about working with his wife.

“It was quite nerve racking at first I think," he said. "It’s a bit nervous going into it, but then when we started working. We had fun doing it. Liberty is very good.”

Go to The Sun for more on the cheating scandal.