Born: A daughter to actors Kristen Bell, 32, and Dax Shepard, 38, they whimsically announced on Twitter Thursday (“My new roomate poops her pants and doesn’t pay rent”). Name: Lincoln Bell Shepard. Bell was the star of “Forgetting Sarah Marshall” and the cult TV show “Veronica Mars,” soon to be a movie thanks to Kickstarter funding from fans; Shepard is. . . which one is he again? Oh, he’s been in this and that. He’s Crosby in “Parenthood.” You’ll know him when you see him. We learned a while ago that he is not the same person as Matthew Lillard and hope you, too, have stopped making that mistake. Dating since ’07, they have been perma-engaged for a few years and say they’re waiting until same-sex marriage is legal too.