Kelly and her husband Brandon Blackstock welcomed their first child together on June 12th.
Kelly captioned the professional photo of her daughter by revealing her little girl’s weight and height: "Here is our beautiful baby girl River Rose; 6lbs 6oz, 18 inches, and the greatest thing on the planet :)"
Clarkson also used the social media site to announce the birth of her daughter last weekend: “Our baby girl River Rose Blackstock arrived on June 12th! Thank you everyone for all of your well wishes! Brandon and I are on cloud 9!”
Kelly married her husband Brandon in a small ceremony last October.