The Poison drummer and his ex, Melanie, will share joint custody of their 2 kids — 7-year-old Jude and 4-year-old Lucy. Rikki will pay $2,000 a month in child support until the kids turn 18 … and he’ll also cover their club activities — karate, tennis, swimming, etc. Melanie gets $1,000 per month in spousal support for 3 years.

Everything pretty much went according to their prenup, with one twist — if Rikki’s on a “full scale” tour with Poison … his child and spousal support payments double in those months.

Rikki also has to pay off a Dodge Charger for Melanie and fork over $45k from the sale of one of their properties.

The above content courtesy of TMZ