Keshia Knight Pulliam is positive Ed Hartwell is the father of her unborn child, and she's down to prove it to him.
Keshia was completely blindsided by the ex-NFL player's divorce petition earlier this week ... according to a source close to the former 'Cosby Show' star. We're told she's secure in the fact she's been 100% faithful to her husband of just 7 months, and has no idea why he'd assume otherwise.
Also, she has no objection to taking the paternity test he's requesting.
Keshia's pissed Ed ran to court to file divorce docs.