The three royals were at the organisation's central London headquarters on Monday morning (26 October) to watch the premiere of Shaun The Sheep: The Farmer's Llamas and take part in workshops about animation.
Kate, 33, arrived wearing an eye-catching Tabitha Webb dress and black heels, while both Wills and Harry were suited and booted for the event.
FYI: If you fancy snapping up Kate's silk dress before it sells out, you can get it here but warning: the space-inspired 'Meg' frock will set you back £375!
Tabitha Webb is a luxury British label launched in June 2013 which counts Kate's sister Pippa Middleton among its famous fans. The brand collaborated with Pippa recently on an exclusive dress and scarf to raise funds for the British Heart Foundation's London to Brighton bike race.
At today's event, Kate, William and Harry were joined by children from some of the charities they support as part of a creative industries-themed Charities Forum event hosted by BAFTA and Aardman Animations, the company behind Shaun The Sheep.
The event included a screening of Shaun The Sheep's latest adventures plus an insight into how the animation studios work, as well as masterclasses and interactive workshops.
Prince William has been President of BAFTA since February 2010, taking over from the late Lord Attenborough. Other royals to have been president include William's grandfather, Prince Philip.
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