Star Kids' Movie Cameos

Vivienne Jolie-Pitt! Willow Smith! The Apatow girls! See which celeb cuties made their acting debuts in their famous parents' films

MAUDE & IRIS APATOW: THIS IS 40

With dad Judd Apatow serving as director and producer, Maude, 14, and younger sister Iris, 10, will again show off their comedic chops alongside real-life mom Leslie Mann and Paul Rudd in the upcoming Knocked Up spinoff, playing the daughters of a dysfunctional married couple dealing with getting older.