Jessica Simpson confirms baby #2!

Jessica Simpson isn't wasting any time adding to her growing family.

The singer has been rumored to have another bun in the oven for weeks now and confirmed the news with a tweet on Christmas Day.

Simpson sent out a photo of her nearly 8-month-old daughter playing in the sand in Hawaii next to the words 'BIG SIS'.

It will be the second child for the 32-year-old pop star and her fiance Eric Johnson, reports TMZ. Simpson gave birth to daughter Maxwell Drew Johnson on May 1, 2012.  

Simpson's pregnancy weight was a big source of discussion the first time around and earned the singer a $4 million contract with the weight loss company Weight Watchers. She famously lost 60 pounds after Maxwell was born by following the diet plan. 

The singer confirmed the latest pregnancy herself in the newest commercial released Wednesday by Weight Watchers. 

"Being healthy has become a part of who I am," Simpson says in the ad, "which is great timing, because I'm having another baby. I feel like I'm on top of the world." 

Weight Watchers told E! Online that Simpson won't be dieting during her pregnancy and will get the go-ahead from her doctor when she decides to resume the program after the baby is born.

"There have been no changes to our business agreement with Jessica," a rep for Weight Watchers told ABCNews.com. "Jessica's successful weight loss prior to becoming pregnant will be featured in Weight Watchers' new 'Expect Amazing' advertising campaign, including a spot with her sharing the happy news."