sherri shepherd & lamar sally

*The messy situation between Sherri Shepherd and Lamar Sally continues.

Shepherd reportedly doesn’t want anything to do with her unborn surrogate baby … because she believes her estranged husband defrauded her into having the kid in the first place so he could get child support, according to TMZ:

Sherri and her husband Lamar Sally each separately filed legal docs to end their marriage. The big complication — a baby will be born this month to a surrogate who signed a contract with Sherri and Lamar.

Now our sources say … the baby was conceived with Lamar’s sperm, but NOT Sherri’s egg.

Now here’s where it gets tricky. We’re told Sherri does not want custody or even to be considered a parent … because she doesn’t want to get stuck with massive child support payments.

Sherri wants a judge to rule she has no parental rights or responsibilities — which would shut the door to child support. She claims Lamar defrauded her — that he got her to sign on for a surrogate birth knowing full well he would divorce her and then nail her to the wall for child support.

You can get MORE of this story at TMZ.