"I had to. I had to know," the actress said. "I was hooked."
Cena said Dewan's interest in wrestling made his day and he praised WWE for having their first all women's main event at WrestleMania.
Cena also asked if Dewan would be willing to get into a WWE ring.
"I am absolutely not that tough," she said.
Dewan, 38, and Kazee, 43, were first linked together in October. Dewan was previously married to Channing Tatum whom she shares 5-year-old daughter Everly with.