Ryan Gosling and Eva Mendes Kiss at Disneyland

It's not uncommon for celebrities to start dating fellow celebrities, especially when they work together on an upcoming film. The long hours, the late nights, the romantic scenes together -- it's totally understandable. Everyone wants to see the beautiful people who hook up on screen hook-up in real life (art imitates life after all), but some stars seem to think it's a mandatory requirement to date your co-workers. This past weekend, Ryan Gosling was seen getting very cozy with his colleague, Eva Mendes, in Disneyland.