Jessica Simpson sure is a hot topic of discussion on Twitter these days. The singer/actor who is currently on a vacation in Hawaii titillated fans with a picture she posted on Twitter. Simpson showed off her ample cleavage dressed in a red cover-up kaftan and cowboy hat and captioned the picture, "Fun in the sun..." The social networking site is now abuzz with her followers retweeting the picture.

Simpson is enjoying the holiday with her fiancé Eric Johnson and daughter Maxwell. She is also accompanied by her mother Tina, sister Ashlee and nephew Bronx.

The 32-year-old seems to love connecting with her fans on the social networking site. She also broke the news of her pregnancy through Twitter on Christmas. Simpson's pregnancy has been speculated for quite some time now and she finally confirmed the news when she tweeted a picture of her daughter Maxwell sitting on the beach next to the words "BIG SIS."

Even when Simpson was pregnant with Maxwell in 2011, she had posted a picture of herself in a Halloween costume saying, "It's true! I am going to be a mummy."

After the birth of Maxwell, Simpson signed a deal with "Weight Watchers" a weight loss company and now appears in their ads. There have been speculations on how her pregnancy is likely to affect the deal but a representative of Weight Watchers recently told abc NEWS that though Simpson will not be following the brand's diet plans, the contract still holds good.

"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," the representative said.