It's official! Jessica Simpson and Eric Johnson -- parents to 7-month-old Maxwell Drew -- are awaiting their second bundle of joy. After weeks of speculation, Simpson confirmed the news on Christmas Day with an adorable Twitpic of her baby girl sitting in sand next to the words "Big Sis." The fashionista wrote, "Merry Christmas from my family to yours." On Nov. 28, a source told Us Weekly, "It definitely wasn't planned -- she really is overjoyed!" Click ahead to look at Jess' most adorable mommy moments so far.