A $400 million Oscar winner wins big in divorce court after spouse called him a 'cheapskate'. He also said she's made "baseless attacks" on his character. 

She also claims he accused her of being a "cheat" after she filed for divorce in May, giving TMZ ... millions of dollars.

The "Yellowstone" star reportedly accused his ex-girlfriend of engaging in a "relentless jihad" against him and bringing a "completely unnecessary" level of "animosity" to their divorce proceedings.

He made the allegations in legal documents filed before he and his ex-wife faced off in a Santa Barbara, California court in late August over child support payments.