She finally popped! And we bet she's soooo happy :)

Jessica Simpson gave birth to a TEN-POUND, THIRTEEN-OUNCE bundle of joy today and the singer/entrepreneur Instagrammed a pic of her two little girls to announce the happy news. After a challenging pregnancy which saw Jess with swollen feet, acid reflux, and other ailments, the 38-year-old and her hubby Eric Johnson have welcomed Birdie Mae Johnson into the world.

In the pic, Simpson's daughter Maxwell, 6, is holding little Birdie's hand and son Ace, 5, barely peeks in the edge of the frame as he looks down on his new baby sister.

Just yesterday, Jessica shared a pic of her big baby bump in a bikini, as she enjoyed the warm southern California weather at the very end of her pregnancy. And today, the baby's out! Congrats!