Charlie Sheen's Wife Scores Modestly in Prenup

Brooke Mueller will not be winning the lottery if she divorces Charlie Sheen ... according to their prenup.

The 60-page document, , outlines Brooke's take if the marriage ends. Among the payouts ... there's a marriage signing bonus of $500,000. For the first 10 years, Brooke gets $300,000 for every year she's married. The couple was married May 30, 2008.

Brooke would get around $2.35 million for her share in the couple's Bev Hills home if they divorce now. And she'd get $100,000 to cover moving expenses.

In all, according to Gawker, Brooke's take would be $3,566,000.

But has learned there is more for Brooke. Sources familiar with the prenup tell us she also would get $55,000 a month in child support, plus a number of add-ons -- like medical expenses and schooling -- which could take monthly support north of $125,000.

Fun fact -- Charlie's net assets are $16 million, which includes a $5.6 million watch collection.