Hartwell reportedly filed for divorce on Monday, July 25, 2016, in Atlanta, exactly one week after the former child star announced her pregnancy.
He is also reported to be demanding a paternity test for their unborn child, even as Pulliam is reportedly contesting his petition.
"The Cosby Show" child act revealed her pregnancy on July 18 but Hartwell seems to have doubts that he is the father of the baby.
Speaking with YBF.com, Hartwell said:
"Right now, the only thing I want is a paternity test for the baby."
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The couple dated fof barely four months before getting married in January this year. Hartwell was previously married to Lisa Wu.