Will and Kate Dazzle at 'War Horse' Premiere

Prince William and Kate Middleton attended the premiere of War Horse in London's West End Sunday, where the royals left even the stars star stuck, including director Steven Spielberg.

"I'm excited to see them again," Spielberg said. "I haven't ever met Kate, and I met William when he was very, very young so I'm looking forward to seeing him again."

The event benefited the Foundation of Prince William and Prince Harry.

"I just want to say thank you for coming, " War Horse star Jeremy Irvine said excitedly. "It's a huge honor to have them both here, and for such a great cause as well, so I'm just thrilled they're here."

Check out the video to see the Duchess of Cambridge's lacy floor-length Alice Temperley gown, and Prince William's gentlemanly gesture when it starts to rain.