Rapper Future’s Baby Mama — He Lied, He’s Ballin

Exclusive 0322-future-gettyRapper Future“s baby mama #1 is going back to the Future — for child support, because she believes he swindled her by lying to the judge about his net worth.

our sources broke the story … Future and baby mama Jessica Smith struck a child support agreement in which the rapper agreed to pay $1,662 a month for their 10-year-old son … predicated on his monthly income which he set at  $16,516.

But days after they hashed out the agreement, Smith says Future — real name Nayvadius Wilburn — went on TV and boasted he carries $25,000 cash on him at all times … MINIMUM.

Smith immediately went back to court, filing new docs to invalidate their deal and increase his child support obligation.  She believes his actual monthly income exceeds $50,000.

Calls to Future were not returned.