07/15/2013 at 05:30 PM EDT
"They always claim they know me/Comin' to me call me Stacy," she famously sang – but now she's officially "Fergalicious."
, who was born Stacy Ann Ferguson, officially changed her name to Fergie Duhamel on July 10, according to documents filed in a Los Angeles county courthouse.
The pregnant pop star
, 38, now has the same last name as her hubby, Josh Duhamel
, whom she married in January 2009
. The couple expect their first child
in late August/early September.
Formerly a member of the all-girl group Wild Orchid in the early '90s through early '00s, the performer wasn't known as Fergie until becoming the frontwoman of the Black Eyed Peas in 2003.