Cook has been accused by his wife, who is suing for divorce, of having an affair with Barrino and making a sex tape.
Antwuan Cook and Fantasia were seen in a public park, locked in deep conversation, surrounded by television cameras. The singer is making a reality show for VH1, "Fantasia for Real."
The two "dated on and off for 11 months," Gene Morris, attorney for Fantasia, confirmed to People.
A week before, Fantasia was rushed to the hospital after overdosing on aspirin and sleeping aids.
Her manager, Brian Dickens, said the overdose happened the same day Fantasia read the details of Antwuan Cook's divorce filing.
"Fantasia is heartbroken and is sorry for any pain she may have caused," Dickens said in a press release, “she was totally overwhelmed by the lawsuit and the media attention.”
In addition to her reality show, Fantasia also has a new album upcoming, due out August 24.