The 'My Life Would Suck Without You' singer and talent manager husband Brandon Blackstock announced in late November last year that they are expecting their first child together.
Kelly said back in November she had a "gut feeling" it would be a girl and it turns out she was right! She tweeted today: "We just found out we're having a girl officially! I knew it! Only a girl could cause this much drama with all this vomiting ha!"
Just a few days ago, the original American Idol winner had told Twitter followers she was suffering from morning sickness. At one stage it was so bad, she jokingly said it was a "small victory" she hadn't thrown up while walking her dogs.
She added to one follower: "I usually puke all day long so you can see how this is a big moment for me haha."
And, appearing on US TV in November, she had said: "I'm way to early to know (the sex). It's a gut feeling because she's killing me and of course, it's a girl right, who's causing the trouble?! I don't know why they call it morning sickness - that's my big joke right now. It's like all day and all night. I'm just looking forward to the second trimester. They say it's better."
Despite feeling sick, it's clear Kelly has been loving her pregnancy.
The country star announced her happy baby news just a few weeks after marrying Brandon in a romantic ceremony at Blackberry Farm in Tennessee - and the 31-year-old had made no secret of her desire to start a family before the big announcement, even saying on US radio shortly after the marriage that all she wanted for Christmas was to be pregnant.
"I want babies! Everybody keeps saying, 'What do you want by Christmas?' I keep saying, 'I want to be pregnant!' I never used to really want kids as I'm kind of selfish with my career but going to soccer games, doing the homework [with my stepchildren], I just love it," she said.
"It sounds so cheesy but it's such a bigger point to kid. I'd like two more – I've already told Brandon! I don't care if it's a boy or girl. I don't just want to have one as they'd be alone. I want two. [Brandon] is excited about all the practice!"
Congratulations to Kelly and Brandon!
More star babies on the way! Pregnancies announced in 2014 in pictures:
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