The Grammy winner's representative confirmed the name change on Friday.
Fergie is a member of the Black Eyed Peas. She released her solo debut, The Dutchess, in 2006.
It launched five big hits, including Fergalicious and Big Girls Don't Cry.
The 38-year-old singer is married to 40-year-old actor Josh Duhamel. She is pregnant with their first child.
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