Let's take a look at two comments by the Kat, the first from a story about her role in "Nick and Nora", and the other via Wikipedia:
"I had to ask people around the set about the Hebrew words," she said in a phone interview with The Jewish Journal. "I couldn't pronounce it."
....Dennings stated to The Jewish Journal of Greater Los Angeles that Judaism "is an important part of my history, but, as a whole, religion is not a part of my life."
Kat seems to be separating her religious practice (or non-practice) from her heritage. And whether she realizes it or not, our Kat makes an important point. If you are born Jewish, you are Jewish, whether or not you go to synagogue on the Sabbath. Or the High Holy days. Or at all.
Just ask all those victims of Nazi Germany, who - despite protestations that they weren't practicing Jews, or they were only half Jewish, or even only a quarter Jewish, or didn't even know they had Jewish blood - were burned alive in the camps anyway.
Important to realize, especially in these times, with the return of rabid antisemitism abroad, and the flowering of it in America, as key media figures accuse Jews of being Israel-firsters, or of buying off Congress, while a feckless president smirks, snarks, and turns a blind eye.
It seems as if our Hot Kat knows better. And while she might not observe the rites and rituals, her candle of Judaism still burns bright within her.
Let's bask in her glow, shall we?