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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You're highly sentimental. Listening to your favourite music from childhood or flipping through old books may cause laughter to erupt or tears to flow. Don't be ashamed to show your soft side. Although you're extremely headstrong and determined, you also have a heart of gold. Many people don't know this about you, because they're too intimidated to make friends. Fortunately, you have a group of loved ones who know the real you. Arrange to meet with your favourite people for a festive dinner.More