Hill also wanted to refute rumors that Marley abandoned her while she was pregnant.
The Internet was a buzz after word came last week that the Grammy winner had a baby boy. Marley, the father of her five other children, sent a message on Twitter "forwarding all well wishes to Ms. Hill on the birth of her new son."
That tweet, along with pictures showing him in an embrace with another woman, created speculation.
Hill has rarely discussed their years-long relationship. She posted a message on Twitter and her website Tuesday defending Marley. She says they've had a "long and complex history" but love their five children together.
The Associated Press contributed to this report.