NIKKI SIXX MY FAMOUS EX WINS BIG … IF I MAKE $10 MILLION!

Think Motley Crue bassist Nikki Sixxcan rake in $10 MILLION this year?

His famous ex-wife sure hopes so … ’cause if he hits the $10 million mark, she stands to pull in a ton of money in child support … this according to legal docs obtained by TMZ.

Sixx divorced former “Baywatch” actress Donna D’Errico almost 10 years ago — but they have a minor child together … and Nikki’s still on the hook for child support payments.

Sixx has already agreed to pay roughly $8,200 per month … but she also gets a cut of any money he makes over $1.6 million … with a cap if he makes $10 million or more.

If he hits the $10 million mark, Donna stands to get $252k per year … not bad considering she claims she’s only making $40k annually on her own.

Nikki just wrapped up his farewell tour with Motley Crue — and it’s a good bet he made some real money.

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