Kleenex for Kate as she sheds a tear at War Horse premiere (and director Steven Spielberg admits he cried too)

By Rebecca English, Royal Correspondent

Last updated at 3:50 PM on 9th January 2012

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As the story of an unlikely friendship between a boy and his horse, it is an unashamed weepy designed to tug on the heartstrings.
And it certainly had the desired effect on the Duchess of Cambridge, who apparently cried from start to finish at last night’s royal premiere of Steven Spielberg’s new film, War Horse.
In an interview with BBC Breakfast today, the legendary director revealed that his actress wife, Kate Capshaw, had even been passing tissues to sobbing Kate.
‘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 ... 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,’ he said. 'According to my peripheral vision her eyes were dabbed.'

Emotional: Kate shed a tear while watching the premiere of War Horse last night - but Steven Spielberg's wife was on hand to pass her a tissue

The Duchess of Cambridge opted for a creation by Alice Temperley –  fit with a plunging neckline and fishtail

The director, who admitted he cried at the stage production of War Horse, said he did not know if Prince William also shed any tears.
Kate, who celebrates her 30th birthday today was attending the premiere, in aid of the Foundation of Prince William and Prince Harry, at London's Leicester Square last night.
The stars of the film, including Emma Watson, Tom Hiddleston and Benedict Cumberbatch were also present.
Themovie, which has been tipped for an Oscar, is an adaptation of Michael Morpurgo's classic novel, where a boy tries to track down his horse after it is shipped away to serve in World War One.