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. We're told she firmly believes couples should work things out because that's what her parents have done to stay together for almost 40 years.
That kind of happy ending doesn't seem to be in the cards -- we're told Ed's no longer living in their house. As one source put it, "What kind of man files for divorce from his pregnant wife?"