Woody, Buzz, Jessie and the Lots-O-Huggin' Bear were all present at the Empire Cinema in Leicester Square, as were celebs such as Jenny Frost and Gail Porter.
However, it was Penny Lancaster's party who stole the show, as not only did she wear cowboy boots for the event, her son Alistair, four, dressed up in a Woody fancy dress costume.
He was joined by one of his friends, who came as Jessie the yodelling cowgirl.
The traditional red carpet was replaced with a Lego design for Toy Story 3, which tells the tale of what happens to the toys when Andy grows up and leaves for college.
It is 15 years since the original movie hit cinema screens, but the new installment has already received rave reviews from critics.