Sources say Tom Cruise has finally found a new partner, and this one could be a better match for him than Katie Holmes—because she's a Scientologist, too. The New York Post reports that Cruise has been dating Laura Prepon, star of That '70s Show and Orange Is the New Black, but a source says they've been keeping their relationship on the down-low. British tabloid Grazia also published rumors of their romance last fall. Reps for both deny the reports, however. (In less-happy celebrity relationship news, Will Arnett has now officially filed for divorce from Amy Poehler.)