Fergie, Josh Duhamel expecting first child

Singer Fergie will soon have another "hump" to croon about.

The 37-year-old pop star announced on Twitter Monday that she and her husband, actor Josh Duhamel, are expecting their first child.

"Josh & Me & BABY makes three!!!" the enthusiastic mom-to-be tweeted along with the hashtag "my lovely baby bump." She also included an image of what appears to be herself and Duhamel when they were little ones themselves.

Duhamel, 40, said in January that he and Fergie were definitely planning to start a family.

"Oh, yeah, it's in the cards," the "Safe Haven" star told CNN. "I'll let you know."

Duhamel, an "All My Children" alum who's also starred in the "Transformers" franchise, married Fergie in 2009. Born Stacy Ferguson, Fergie's seen success as both a member of the Grammy-winning group the Black Eyed Peas and as a solo artist with songs like "Fergalicious" and "Glamorous."