After weeks of rumors and reports, Jessica Simpson finally confirmed her second pregnancy Tuesday on Twitter, posting this adorable pic of 8-month-old daughter Maxwell with "Big Sis" written in the sand in front of the little tot.

Jess captioned the photo: "Merry Christmas from my family to yours!" -- hers, a growing family with fiance Eric Johnson.

Simpson signed on as a Weight Watchers spokeswoman after her first pregnancy and lost over 50 pounds after giving birth in May. The Twitter page for the weight loss program read today, "Your WW family is so thrilled for you. What an amazing year you've had!"

An amazing year, indeed. Now wouldn't it be even more amazing if the soon-to-be second-time parents tied the knot before Jan 1?!