Black Eyed Peas singer Fergie, 37, and her US actor-husband Josh Duhamel, 40, are finally expecting their first child.

He took to Twitter saying: "Fergie and Me and BABY makes three."

The couple were married in 2009.

Fergie showed no sign of any baby bump at the Feb5 premiere of Duhamel's new movie Safe Haven.

But he recently told Parade magazine that his role as a single father in the film gave him a glimpse of fatherhood.

He said: "It's something I've always wanted. It's the most important thing.

"When I do become a father, it will be my greatest achievement."

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