Credit: Rob Kim/Getty Images

And baby makes four!

Kelly Clarkson and husband Brandon Blackstock welcomed their second child, a son, on Tuesday, April 12, the singer announced Thursday via Twitter.

“Our little baby boy has arrived!! Remington Alexander Blackstock was born 4/12/16 & he is healthy & we couldn’t be happier or more in love!” Clarkson, 33, wrote.

Clarkson, who is already mom to 22-month-old daughter River Rose with Blackstock, announced her second pregnancy during an August 2015 concert at Los Angeles’ Staples Center.

During her pregnancy, Clarkson spoke about how her morning sickness was just as bad the second time around.

“I’m familiar with all-day sickness,” she told Gayle King on CBS This Morning in November. “I have to get IVs and fluids because I get so dehydrated. It’s really bad.”

But the chance to “pop out magical unicorns” like River Rose, Clarkson said, makes the whole struggle worth it.

Clarkson and Blackstock, a Nashville-based talent manager, got engaged in 2012 and tied the knot in October 2013. Blackstock also has two children, Savannah and Seth, from a previous marriage.