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  (PHOTO)- Twitter: @VanessaLachey
  Vanessa Lachey poses for intimate pregnancy photo taken by husband Nick Lachey

Nick Lachey and his wife Vanessa are expecting a baby boy it has been revealed, and she recently posted an artistic photo of her baby bump on Twitter in an attempt to celebrate her changing body.

Vanessa, 31, is pregnant with the couple's first child and the pair are reportedly "so thrilled" about their baby's sex, a source told In Touch Magazine.

On Monday the TV host took to Twitter where she shared a revealing silhouette picture of herself with her 71,000 followers.

The photo shows her dressed in what appears to be a two-piece bikini, laying in a shallow pool by the ocean with an alluring sunset background. Vanessa's baby bump is revealed with beams of the sunlight reflecting off of it.

"Let's embrace our changing bodies! Show me ur bump & I'll show u mine! Let's get creative!" Vanessa tweeted as part of her #MaternityMonday tweets.

"Thanks for sharing all your beautiful baby bumps and embracing your bodies! As promised, here's one Nick Lachey took," she later tweeted alongside her artistic shot.

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Vanessa has openly shared her pregnancy experience on Twitter and is still fascinated by the whole process.

"I love rolling over when I wake and feeling the baby wake up too," Vanessa tweeted. "It's so incredible!"

The pair recently went on a romantic trip to Jade Mountain in St. Lucia where they spent quality time with one another.

"They had an amazing time on their babymoon. It was super relaxing and fun. It was nice to get away and spend time together," a source told Us Weekly magazine.

Nick, a former 98 Degrees singer who was once married to singer Jessica Simpson, once spoke about his attempts to get Vanesa pregnant.

"I'm doing everything I can. Trust me, it would make me very happy. Family is very important. It's very important to us, and I'm sure that will be around the corner," Nick said.

He recently shared Vanessa's due date while co-hosting the hit ABC morning show "Live! with Kelly."

"[Vanessa's] due late summer, early fall. You find out that you're pregnant and it's the most exciting news and yet you're not supposed to tell anyone for three months. I had to keep this secret for three months," Nick told the audience.