Celebrities Stephen Spielberg, Kate Capshaw and Brad Pitt are throwing their weight behind efforts to stop Proposition 8, the proposed amendment to again ban same-sex marriage in California.

Tim Gunn, Julianne Moore, Jonathan Adler and Kevin Bacon are just a few of the New York City-based celebrities that have come together for the expansion of the official city tourism campaign “Just Ask the Locals” that launched on April 28.