Jessica Simpson has confirmed she's pregnant again.

The Fashion Star mentor made the announcement in a Christmas Day tweet in which she posted a holiday photo of Maxwell Drew, her seven-month-old daughter, sitting in the sand with "BIG SIS" written in the sand in front of her.

"Merry Christmas from my family to yours," Simpson wrote.

Simpson gave birth to Maxwell Drew, her first child with fiance Eric Johnson, on May 1. 

She then began a reported $4 million endorsement deal with Weight Watchers which resulted in her dropping 70 pounds before her weight-loss was unexpectedly derailed by the new pregnancy.

Reports that Simpson was pregnant again had first surfaced last month.

"It definitely wasn't planned," a source told Us Weekly of the pregnancy in November.

A representative for Simpson, who previously starred in VH1's The Price of Beauty and MTV's Newlyweds reality series, had declined comment.

Simpson, 32, and Johnson, a 33-year-old retired former NFL player, got engaged in late 2010. According to Us, the couple had originally intended to get married in 2012 but parenthood became too time consuming for them to engage in wedding planning. Now that Simpson is pregnant again, their wedding will most likely be postponed again.