Gibson, 56, gave Robyn half of his estimated USD 850 million fortune when they divorced in 2011 after 31 years of marriage, reported Contactmusic.
"You'd think someone as wealthy as Mel wouldn't bat an eye at having to hand over half of everything he owns to Robyn especially after the years of hell he put her through with his skirt chasing, drinking and nasty temper tantrums. But he's furious about it," a source said.
However, friends say Gibson is lucky that Robyn, with whom he has seven children, did not push for more money.
"Mel should count his lucky stars though because Robyn could have been spiteful and looked for even more money than she was awarded," the source added.
