When The Duchess attended the premiere of War Horse, it was reported that Middleyon could not keep herself from crying.

If there is one thing that director, Steven Spielberg, could faultlessly do, it is moving people's hearts through his films. Kate Middleton is no different from those who are emotionally affected by Spielberg's films as she was seen crying while watching 'War Horse' on the eve of her birthday in London.

Seated next to Spielberg and his wife, Middleton was caught tearing up, with Mrs. Spielberg, Kate Capshaw, assuring assistance.

"I was sitting next to her and all I know is at one point my wife, who was sitting to my right, right in front of my face she passed a Kleenex" told the Academy Award-winning director to BBC, as reported by Metro.

"I saw the Kleenex go across my face, arrive and stop but I didn't want to intrude on her experience watching War Horse so I never glanced over." added Spielberg in the same post.

Spielberg also mentioned how much he was affected by the story of War Horse that he, himself cried after watching the play.

"The play did that to me. I came out a soaking wet wreck" claims the 65-year-old movie veteran.

Middleton, together with husband, Prince William, attended the premiere of the movie held in London, where she stunned the crowd wearing a sophisticated, laced number by Temperley.

View the slideshow to see photos of The Duchess during the UK premiere and other stars in attendance.

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Kate stole the show and was brought to tears at the premiere of the film, 'War Horse.'

Middleton wore a white gown with black lace overlay by Alice Temperley, one of her favorite UK designers, at the red carpet premiere of Steve Spielberg's "War Horse" in London.

Britain's Catherine, Duchess of Cambridge arrives at the UK premiere of the film 'War Horse' in London January 8, 2012

Middleton wore a white gown with black lace overlay by Alice Temperley, one of her favorite UK designers, at the red carpet premiere of Steve Spielberg's "War Horse" in London.

Prince William and Kate Middleton

Actor Matt Milne attends the UK premiere of 'War Horse' in London

Actor Nicholas Bro attends the UK premiere of 'War Horse' in London

Actor Benedict Cumberbatch attends the UK premiere of 'War Horse' in London

Actor Liam Cunningham attends the UK premiere of 'War Horse' in London

Director Steven Spielberg and producer Kathleen Kennedy attend the UK premiere of the film 'War Horse' in London

Actress Celine Buckens attends the UK premiere of 'War Horse' in London