Sarah Caldwell
February 19, 2013 AT 03:29 PM EST

Fergie announced on Twitter on Monday that she and Josh Duhamel were expecting a baby.

Josh & Me & BABY makes three!!! #mylovelybabybump…

— Fergie (@Fergie) February 18, 2013

Fergie and Duhamel married in 2009. This will be the couple’s first child.

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