TMZ has obtained documents from the Britney/K-Fed hearing last Monday, where it was revealed the popwreck rakes in an average of $737,868 a month.

K-Fed’s lawyer, Mark Vincent Kaplan, claims in a declaration filed last Monday that Britney “is clearly the ‘monied party’ in this case.” Kaplan is asking Brit to front $50K for expenses in connection with the custody hearing, claiming his bill will be in excess of $40,000.

The documents reveal K-Fed is receiving $20K a month for spousal support ...