For over ten years, Kate portrayed Selene, the series' main character. Kate and Len allegedly fell in love while making the first Underworld, although it did not affect their work relationship. However, by the time filming of its sequel began, the couple had been married for about two years. However, they maintained a professional demeanor, although it appears that there were a few occasions that the two found a little challenging while they filmed.
Kate revealed she became aware that she was amid an unusual circumstance while filming some of the love scenes for Underworld: Evolution.
"There is something creepy about your husband videotaping you while you're naked with another man," the actress joked while speaking with the show's host.