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Jessica Simpson pregnant with second child

Jessica Simpson visits Dillard's at International Plaza in support of the Jessica Simpson Collection on Nov. 17, 2012, in Tampa, Fla.
Jamie McCarthy/Getty Images for Jessica Simpson Collection

It's official: Jessica Simpson and fiance Eric Johnson are expecting baby No. 2.

The singer-actress, 32, confirmed the news on Christmas day via a message posted on Twitter.

The message included a photo of the couple's daughter, Maxwell Drew, sitting atop a message written in sand that reads, "BIG SIS":

The announcement comes just seven months after Simpson, 32, and Johnson welcomed baby Maxwell.

Speculation about the "Fashion Star" mentor and Weight Watchers spokeswoman began last month, when Us Weekly reported that she was pregnant again.

Simpson's latest ad for Weight Watchers debuted online last week, touting her post-pregnancy weight loss. According to People magazine, the "Expect Amazing" commercial will begin airing on TV Tuesday.