(CNN) -- Fergie will soon have another "hump" to sing about.
The 37-year-old pop star announced on Twitter Monday that she and her husband, 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, who married Fergie in 2009, told CNN. "I'll let you know."
Looks like the cat's out of the bag, Duhamel.