The 33-year-old singer is due to give birth to a baby boy in less than two months and she said that sometimes it just hits her that there's a tiny person growing inside her.
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She told E! News: "Now it's getting to the time I'm getting a bit antsy and I would really, really love to see the baby's face. I can't wait.
"It's like you're really pregnant when you feel the baby move. You're thinking to yourself, 'Whoa!'
Of course you know there's life that's growing inside you, but when you actually start feeling these different things happening – the flutters, and kicks and punches – it's completely… I'm at a loss for words.
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"It's mind-boggling. It's pretty amazing."
Former Destiny's Child singer Kelly also revealed that she's relaxed her diet and is fully giving in to her pregnancy cravings.
She said: "Right now I just really love nachos. Chocolate ice cream and peanut butter mixed together is just glorious."
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Despite this, Kelly admitted she wasn't prepared for the way her body would change.
She added: "The most shocking thing about pregnancy to me is probably the way your body changes – nobody can prepare you for that. Not a book, not anything. You just go through it."