Josh Altman and his wife, Heather, are expecting their first child together early next year and on Instagram, Heather has been sharing several moments from her pregnancy with her fans and followers.

On Tuesday, ahead of tonight's new episode of Million Dollar Listing: Los Angeles season eight, Heather took to Instagram where she shared a baby bump photo of herself walking up a Los Angeles street with one of her dogs in tow.

"Suns out, tums out...and I mean my big preggers tummy! #25weekspregnant #growingbythesecond," she captioned the photo seen below in which her belly is exposed.

Heather is staying in shape throughout her pregnancy and recently began attending prenatal Pilates classes.

"First day of prenatal Pilates!" she wrote on Instagram last week along with a photo of herself in workout gear. "I've never done Pilates before but have always wanted to try. My body has been stiff, tight, posture is gone and I have lower back pain so my amazing chiropractor @drdavidtannenbaum suggested Pilates with Maria @bodylinela. It was a great experience. Already feeling longer and looser since the first session and a good adjustment after. Thanks @bodylinela and @drdavidtannenbaum. See you guys again Thursday #addicted #24weekspregnant #pilates #babygirlaltman."

To see more of Josh and Heather Altman, tune into tonight's new episode of Million Dollar Listing: Los Angeles season eight airing tonight on Bravo at 9 p.m. and check out a sneak peek below.