October 23, 2015 12:45 PM

Bruce Glikas/FilmMagic

Kelly Clarkson‘s adding a boy to her brood!

The “Invincible” singer took to social media Friday to announce the sex of her baby-on-the-way, sharing an adorable shot of daughter River Rose, 16 months, with the caption: “In other news, River’s gonna have a little baby brother 🙂 #itsaboy We’re so excited!”

Clarkson, 33, first shared that she and husband Brandon Blackstock, 38, were expecting in August, surprising the audience at an L.A. Piece By Piece tour stop with an impromptu, emotional announcement.

“I was not planning on announcing this, but … I’m totally pregnant,” she said, crying onstage at the time.

“My makeup artist is backstage hating me right now. I just don’t want you to think I’m on pills or drunk …I’d like to apologize to my husband. That was not planned. I just didn’t want you to think I was crazy or something. Honestly, I’m just so hormonal today. … I haven’t vomited yet. That is a freakin’ win, y’all.”

The American Idol alum — who, following doctor’s orders, had to cancel the remainder of her touropened up about wanting to expand her family in a PEOPLE interview back in February.

“I want another one … But I’m just a little frightened because [River is] so perfect,” she said. “I feel like something horrible’s gonna come out of me. Because she’s so great — like, the yin to her yang … But I won’t put that out there. I’m gonna project happiness.”

Clarkson married Blackstock in 2013, making her step-mom to Savannah, 14, and Seth, 8, his kids from a previous marriage.

— Jeff Nelson

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