News Kristen & Dax Welcome Baby Girl Published 12:35 PM PDT, March 28, 2013 Getty Images Congratulations to Kristen Bell and Dax Shepard on the birth of their daughter! RELATED - Dax Pens Touching Letter To His Late Father"Lincoln Bell Shepard is here," Dax Tweeted. "She has mom's beauty and dad's obsession with breasts. Hooray!!!"VIDEO - Dax & Kristen Give Hilarious Baby UpdateBell then wrote, "My new roommate poops her pants and doesn't pay rent ... basically @daxshepard1 pre-sobriety :) welcome baby Lincoln xo"This is the first child for both, Dax and Kristen began dating in 2007.