Jessica Simpson has always taken her health and workout very seriously, whether it's first pregnancy, losing baby fat or her second pregnancy. She's very much sticking to that promise.

On Wednesday, the "Fashion Star" judge hit a gym in Los Angeles in teal sweatpants, a black tank, black hoodie ... and her growing baby bump. This is only one of a few times we have really seen her out and about during her second pregnancy, which she announced on Christmas Day with an adorable photo of her daughter with "Big Sis" written in the sand around her.

The Weight Watchers spokeswoman is expecting her second child with fiancé Eric Johnson. The couple is already parents to 9-month-old daughter, Maxwell Drew.

Jessica is doing more than just expanding her family, she's also taking on a maternity-focused business venture. Simpson recently partnered with Destination Maternity to feature her designs at over 800 stores.

"Photo Credit: Humajasmine"

It's official: the stork is once again headed to Jessica Simpson‘s house! Simpson and fiancé Eric Johnson are expecting their second child, the couple announced via Twitter Christmas Day.

Amid growing pregnancy speculation online, the Fashion Star mentor, 32, shared a photo of her baby girl wearing holiday pajamas and smiling in the sand atop the words, "BIG SIS."

"Merry Christmas from my family to yours!" Simpson, 32, wrote as the caption. In the adorable snapshot, Maxwell is dressed in a red-and-white striped onesie, a red bow in her hair and has a big smile on her face.

Simpson's second pregnancy "definitely wasn't planned," a pal told Us. But she "loves being a mom and "is overjoyed."

Wearing a form-fitting black dress, Simpson tried to hide her growing baby bump at BFF Cacee Cobb's wedding Dec. 15.

After welcoming her first child in May, Simpson became a spokeswoman for Weight Watchers and lost over 50 pounds. "Congrats to Jessica Simpson, Eric and big-sister-to-be Maxwell!" Weight Watchers tweeted Tuesday. "Your WW family is so thrilled for you. What an amazing year you've had!"

Is Jessica Simpson pregnant again, seven months after the birth of her first child?

Us Weekly reports that the singer and "Fashion Star" mentor is pregnant again. The magazine quoted a source saying, "It definitely wasn't planned. But yes, Jessica is pregnant again." Simpson's spokeswoman declined to comment on the report to ABCNews.com.

When asked about the latest baby buzz, Simpson's publicist told PEOPLE, "I'm not going to comment on this speculation."

The star and Weight Watchers spokeswoman, 32, (who showed off her 60-pound weight loss this month) called Maxwell's birth "the greatest experience of our lives."

In May, she told PEOPLE, "I don't want to have another baby right away but I do want to have more kids. Having babies back to back has to be so hard."

Having baby No. 2 is all about timing, she added during the interview about becoming a mom.

"I really want to give Maxwell all of the attention and all of the love and time that I possibly can give her," she said. "When I feel like it's the right time to bring another little one into the family, I will. I won't wait too long but I won't do it immediately."

If she is indeed pregnant, it's unclear how this might this affect her contract with the weight-loss program.