Kelly Clarkson is a new mum.

The singer welcomed her first child with husband Brandon Blackstock on Thursday (12Jun14) and announced the happy news on Saturday (14Jun14).

Taking to the Since U Been Gone hitmaker wrote, "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!!"

Clarkson confirmed she was pregnant four weeks after she and Blackstock wed in Tennessee in October (13), and she revealed the baby was a girl in January (14), tweeting, "I knew it! Only a girl could cause this much drama with all this vomiting ha!"