Big Boi of OutKast and his estranged wife Sherlita Patton are at odds over child support payments.

Not only is Big Boi challenging his ex's petition for full custody of their minor child (they also have a child over 18), but he is also refusing to pay excess amounts of child support, citing Sherlita is fully capable of supporting their child as well.

According to TMZ, Big Boi's wife Sherlita Patton filed for divorce last year, demanding FULL custody of their minor child. Big Boi just filed a response, saying their child would be better off with JOINT physical and legal custody. As for child support, Big Boi says he's willing to pay whatever the State of Georgia deems appropriate ... no more, no less ... because Patton's young, healthy, and well-educated, which means she can support herself.