"Lincoln Bell Shepard is here," Shepard tweeted. "She has mom's beauty and dad's obsession with breasts. Hooray!" Bell added, "My new roommate poops her pants and doesn't pay rent . . . basically Dax Shepard pre-sobriety. Welcome baby Lincoln."
On Wednesday, Bell tweeted an adorable photo of her dog, Lola, laying its head on her big bare baby bump. "Eavesdropping," she captioned the shot.
The Veronica Mars star, 32, and Parenthood actor, 38, announced they were expecting last November. The couple, who have been engaged since 2009, said on Larry King Live last August that they were "not really worried" about having children out of wedlock. "The reason we're not rushing to get married is because I don't feel appropriate taking advantage of a right that's denied to my [gay and lesbian] friends," Bell previously explained to The Advocate.