Kelly Clarkson and her husband, Brandon Blackstock, named their first child together River Rose Blackstock. The baby, Clarkson's first and Blackstock's third, was born Thursday, the singer announced on Twitter. "Our baby girl River Rose Blackstock arrived on June 12th!" she wrote. "Thank you everyone for all of your well wishes! Brandon and I are on cloud 9!!" Clarkson and Blackstock, a talent manager, married in October in Tennessee. The baby's birth comes amid rumors Blackstock cheated on Clarkson. In December, a woman came forward claiming that while she hadn't slept with Blackstock, they were "intimate in other ways." "I really hope his wife keeps her eye on him because he's not the great man she thinks he is," said the woman, whose name wasn't reported.