The glamour model kept things casual and cosy in a bobble hat and a white outfit as she struck a pose outside the Vue West End.
Junior, 8, and Princess Tiaamii, 6, opted for a smarter look, with Junior in a sharp button-down cardigan and Princess in a little tutu and pixie boots.
Katie's eldest son Harvey, 11, kept warm in a padded khaki green gilet and Ugg boots.
Kieran Hayler made sure to join his wife and step-children, with the couple's 5-month-old son Jett presumably at home with a babysitter - we guess he's a little young for his first movie premiere, even if it is The LEGO Movie!
It's not the first premiere Princess and Junior have been too this month; the pair also joined their father Peter Andre, Katie's second husband, at the UK premiere of Mr Peabody And Sherman - a film for which peter provides the vocals.
These lucky children have a busier social life than us!