PHOTO: Jessica Simpson Posts Revealing Bikini Shot of Herself

Jessica Simpson is on a roll with the Twitter pics from her Hawaii vacation. First the singer made her official pregnancy announcement by sharing a photo of baby Maxwell Drew with the words "BIG SIS" spelled out in the sand, and then she posted a snapshot of she and fiance Eric Johnson posing along a beautiful Hawaiian beach.

The Fashion Star mentor, 32, has shared again, and it's a very sexy pic of the expecting mama. The Twitter pic shows Simpson wearing a cowboy hat and a cherry-red cover-up to her hot red bikini top that's revealing a dangerous amount of decolletage. 

The Weight Watchers spokeswoman, who also announced that she will not be following the weight-loss program during her second pregnancy (that's against WW's rules of use), is clearly having a wonderful Christmas holiday basking in the Hawaii sun.

It has been an eventful month for the singer-turned-fashionista. Not only did Simpson's first full Weight Watchers commercial launch, but she also served as maid of honor to her best friend CaCee Cobb's wedding to former Scrubs star Donald Faison and confirmed her unexpectedly quick second pregnancy to her millions of followers.

With all the good news in the air, it will be no surprise if Simpson and Johnson, 33, finally decide to follow up their baby news with wedding bells.

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