Fergie and Josh Duhamel have revealed that they are expecting their first child.

The Black Eyed Peas singer announced the news on her Twitter page yesterday (February 18).

"Josh & Me & BABY makes three!! #mylovelybabybump", she posted, along with a photograph of her and Duhamel as toddlers.

Fergie previously told OK! magazine that they are excited to begin a family, saying: "It's definitely something that we're interested in doing. We made no secret of that. We'll be very excited when it happens."

The couple married in January 2009 after dating for four years.

Duhamel can currently be seen in Safe Haven alongside Julianne Hough.