"Parenthood" just became a reality for series star Dax Shepard -- he and fiancee Kristen Bell just welcomed a baby girl!

The proud papa tweeted the news just after noon L.A. time on Thursday, saying "Lincoln Bell Shepard is here. She has mom's beauty and dad's obsession with breasts. Hooray!!!"

Lincoln, for a little girl? We don't know the meaning behind it yet ... but we kinda love it!

The new mom also posted, "My new roomate poops her pants and doesn't pay rent...basically pre-sobriety :) welcome baby Lincoln xo"

We love these two!

No other details were released about the baby yet, but we know she was born in the last 24 hours -- Kristen tweeted the cute bump pic below on Wednesday afternoon.

Little Lincoln is the first child for Bell, 32, and Shepard, 38, who have been together since 2007.

Congrats to the happy couple! Click "Launch Gallery" above for more celeb baby names.

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