E! News reported Thursday the 37-year-old "The Real Housewives" star recently split from Dennis McKinley, whom she got engaged to in September.
Us Weekly confirmed Williams and McKinley, who are parents to 3-month-old daughter Pilar, have broken up.
"There is a tiny, tiny, tiny chance they would get back together," a source said. "[But] likely no."
News of the split follows rumors McKinley cheated on Williams with "WAGS Atlanta" star Sincerely Ward.
YouTube personality Tasha K claimed as much in May, but McKinley denied the reports in a statement through a rep.
"[Tasha K] published a series of false salacious and slanderous allegations against Mr. McKinley, either knowing they were false or with a reckless disregard for the truth of those statements," McKinley's lawyer said May 31 to Page Six.
Ward also denied the rumors.
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"Number one, I know Porsha and I respect Porsha and I would never be involved in this kind of trash. Number two, I've never met this guy a day in my life," she said.
Williams was not wearing her engagement ring in a photo she posted from her vacation with Pilar in Hollywood, Fla., on Wednesday.
"Finally got to take a much needed vacation with my family," she captioned the post.
Williams had wished McKinley a happy Father's Day in a post Sunday.
"Happy 1st Fathers Day Dennis! Pj @pilarjhena is blessed to have such a wonderful dad like you. It's beautiful to witness the bond you have with our tiny angel," she wrote.
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