The actor said the image director Paul King sent as a joke "shocked" his kids.
The actor stars alongside Timothée Chalamet in the origin story of one of Roald Dahl’s most famous characters.
The Call Me By Your Name star is set to play Willy Wonka in a brand new prequel.
The people behind the much-loved Paddington films are also involved in the Willy Wonka origin story.
The former child star's family said she had suffered "a massive seizure".