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Jessica Simpson shows off baby bump

Now we have proof that Jessica Simpson is indeed pregnant with her second child. Less than a week after revealing that she's expecting, the 32-year-old singer/actress posted a self-portrait photo of her baby bump alongside the caption: "Bumpin' and Proud!"

Over the past week, Simpson has been tweeting photos while in Hawaii with her fiance, Eric Johnson, their 7-month-old daughter Maxwell and Simpson's younger sister, Ashlee.

Simpson ended weeks of pregnancy speculation when she posted a photoon Christmas Day of her daughter, alongside the words "BIG SIS" etched into the sand.

The announcement came in the midst of the actress/singer's campaign for Weight Watchers. Simpson, who is a celebrity ambassador for the brand, recently debuted a new ad in which she talks about staying healthy while being pregnant. "Being healthy has become a part of who I am," she says in the spot. "Which is great timing because I'm having another baby. I feel like I'm on top of the world."

Simpson, who lost 50 pounds after her first pregnancy, won't be following the Weight Watchers program during her pregnancy, but is expected to return to the regiment after giving birth. Check out the ad below: