#18: Mel Gibson & Robyn Moore Gibson
Relationship Duration: 26 years
Est. Divorce Cost: ~$425 million
Mel Gibson’s divorce from Robyn Moore remains the most expensive in Hollywood history. They met before his fame, but after decades of hit films and directing successes, Gibson’s net worth had soared to nearly a billion dollars. Because there was no prenuptial agreement, Robyn was entitled to half his fortune under California’s community property law.

Their split followed years of quiet separation and was finalized after Gibson’s highly publicized affair and subsequent scandal. Friends said fame, lifestyle differences, and personal turmoil wore away the marriage. Despite the staggering cost, Robyn has largely stayed out of the spotlight since, while Gibson rebuilt his career in later years.
