Jamie Lynn Spears's fiancé Casey Aldridge out canoodling another woman the night before she gave birth?

“Casey and an old girlfriend were hugging in a more than friendly way,” an eyewitness revealed.

“Once people started to notice and pay attention, they quickly moved into a parked truck with tinted windows.”

Later, the two emerged, “laughing and flirting late into the night”. They were “all over each other,” added the eyewitness.

While surfing the Internet at her mom’s home, Jamie Lynn discovered photos of Casey with another woman, which led to a huge fight.