Fantasia -- Sued for Mysterious Bank-Stiffing

Let's hope Fantasia Barrino listed "cash" on her new baby registry, because she might need it -- TMZ has learned she's on the receiving end of a new $25,000 lawsuit.

According to the lawsuit, filed last month, the former "American Idol" champ -- who announced earlier this week she is expecting baby #2 -- is being sued by a collection company on behalf of U.S. Bank for allegedly owing them money.

The lawsuit doesn't explain why, and neither side would go into details, but the suit is asking for $25,057.02 plus 10% interest per year dating back to May 2009.