Steven Spielberg and his wife, Kate Capshaw, are the latest celebrity donors to the fight against California's November ballot initiative that would overturn the state Supreme Court decision legalizing same-sex marriage.

Spielberg and Capshaw have donated $100,000 to fight Proposition 8, they announced in a statement Monday.

"By writing discrimination into our state constitution, Proposition 8 seeks to eliminate the right of each and every citizen in our state to marry regardless of sexual orientation," the statement said. "Such discrimination has NO place in California's constitution, or any other."

Also known as the Marriage Protection Act, Proposition 8 would amend the state constitution to limit marriage to a man and a woman. If passed, it would overturn the court decision that made the state only the second in the U.S. to legalize same-sex marriage.

Brad Pitt gave the same amount to the cause last week.