Jessica Simpson showed off her new baby bump in a photo she uploaded onto Twitter on Sunday, Dec. 30. 

The soon-to-be mom announced her second pregnancy recently and tweeted a new photo of herself on Sunday posing in front of a mirror while wearing a bikini and a matching robe that was left untied to flaunt her bare baby bump front and center.

"Bumpin' and proud!" Simpson captioned the photo. She is currently on vacation in Hawaii with her fiance, her best friend CaCee Cobb and others. On Dec. 16, Simpson was a bridesmaid at Cobb's wedding to "Scrubs" star Donald Faison. 

Simpson confirmed that she and fiance Eric Johnson are expecting again on Christmas Day by tweeting a photo of daughter Maxwell Drew Johnson, almost 8 months, sitting on the beach in front of a sand-drawn sign that said "Big Sis."

Simpson's daughter was wearing candy cane-red striped pajamas with a red bow in her hair for the picture. The photo was accompanied with the tweet, "Merry Christmas from my family to yours!" The news surprised many since Simpson recently revealed that she lost 60 pounds in five months thanks to Weight Watchers.

Simpson signed on with Weight Watchers to be there celebrity spokesperson in May 2011 in an estimated $3 million deal. The collaboration was decided on the same month that Simpson gave birth to daughter Maxwell. 

Following her pregnancy announcement on Christmas, a spokesperson for Weight Watchers confirmed that Simpson will not continue her Weight Watchers diet now that she is pregnant with her second child. However, she will continue to appear in ads for the weight loss company. After she gives birth, the singer and her doctors will decide when she can once again follow the Weight Watchers program.

Tags: Jessica Simpson Eric Johnson Weight Watchers