The former Destiny's Child star was reported to have taken the role to Beyonce and Jay-Z's first child.
The singer told E! News that she already has godchildren - but one of them isn't Blue Ivy.
"I am a godmother. My godchildren are all in middle and high school right now, which is so weird," she went on.
Asked whether she wanted to get hitched and become a mum, she replied: "I don't know. Too busy with the career.
"I do want kids, I do want to be married. But, I want one kid."
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It feels like friends are few and far between. If you're not getting the help you need, ask why. It may be because you have been so preoccupied with work. Skipping special occasions and failing to return phone calls causes resentment. You have to be more engaged to sustain loving bonds. Call someone you've missed. It may take a few tries, but it's worth the effort. Be forthright about why you have been out of touch. Communication is the cornerstone of every healthy relationship.More