It's been a jet-setting few days for celebrity babies and their parents. Brad Pitt brought his children to the movies in the UK, while Salma Hayek and Valentina Pinault took off from LAX. Tobey Maguire had fun in the sun with his kids on a beach in Sydney, and Gwen Stefani tested the water in Malibu with Zuma — click through to see what they were all up to!