Hayden is newly engaged to boxer Wladamir Klitschko. But she allegedly flirted back and forth with Jay, who is married to actress Daniella Deutscher, on set this spring.
The two “held hands and one of them almost always had their arm around the other,” the insider says. “Hayden never let Jay out of her sight.”
The source added that Hayden and Jay had no problem putting their fondness for each other on display.
“Most days, Jay would be done shooting his scenes hours before Hayden,” said the source. “But instead of going home, he’d wait for her and they’d leave together in her car.”
A different source also claims to have seen the duo leaving in the same car. “They openly kissed before driving off together.”
The source continued, “Everyone knew about it. … Hayden was not discreet at all.”
Representatives for Hayden Panetierre and Jay Hernandez have reportedly denied any “off-screen” action.