FAMILY CODE SECTION 3585-3587
3585. The provisions of an agreement between the parents for child
support shall be deemed to be separate and severable from all other
provisions of the agreement relating to property and support of
either spouse. An order for child support based on the agreement
shall be imposed by law and shall be made under the power of the
court to order child support.
3586. If an agreement between the parents combines child support
and spousal support without designating the amount to be paid for
child support and the amount to be paid for spousal support, the
court is not required to make a separate order for child support.
3587. Notwithstanding any other provision of law, the court has the
authority to approve a stipulated agreement by the parents to pay
for the support of an adult child or for the continuation of child
support after a child attains the age of 18 years and to make a
support order to effectuate the agreement.