Hayden Panettiere might have landed herself in a cheating scandal, as she’s being accused of cheating on her fiancé with her married Nashville co-star Jay Hernandez.

The actress is engaged to heavyweight champion Wladimir Klitschko and Hernandez is married to Daniella Deutscher, but an on-set source told Star magazine they were getting pretty cozy with one another last spring.

"[Hayden and Jay] held hands and one of them almost always had their arm around the other. Hayden never let Jay out of her sight," said the source.

"Most days, Jay would be done shooting his scenes hours before Hayden. But instead of going home, he’d wait for her and they’d leave together in her car.They openly kissed before driving off together. Everyone knew about it. … Hayden was not discreet at all,” the source continued, Perez Hilton reports.

However, reps for the co-stars are denying the story, telling Gossip Cop “This story is completely fabricated and untrue.”

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