Jessica Simpson is going viral this morning, after she shared a revealing pregnancy photo on her Instagram account yesterday.

The 38-year-old blonde beauty gained close to 100 pounds this pregnancy, and she's huge. But Jessica kept up her sense of humor as she captioned the photograph: 'Jess-tation'.

Here is the pic:

Jessica is waiting anxiously for the birth of her third child with second husband, retired NFL player Eric Johnson. Jess is 9 months along in her pregnancy - so she's due any day now.

The 38-year-old has been having a difficult pregnancy this go around. She's been hit with  variously ailments, including insomnia, severe acid reflux, bronchitis, back pain and anxiety.

But Jessica's children — Maxwell, six, and Ace, five — are 'so excited' to be a big brother and big sister.

Jessica told her fans: 'They're so excited because they're only fourteen months apart, so they didn't get to experience the excitement of each other. But when I told them that we're having another baby, I know that they'll remember that for the rest of their lives'.

'They are most excited about learning how to do the swaddle. Maxwell, my daughter is just so happy that it's a girl. They ask me the craziest questions that I can't say on TV ... 'How does the baby come out?' 'Where does the milk come from, I don't understand!' I'm a little bit too honest, and Eric's like, 'I don't think we need to give out ALL the information, Jessica. So, I'm scaring my kids, I think.'