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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