Model Sarah Stage stays so fit you can barely tell she's 8 1/2 months pregnant

Hollywood Moms React to Pregnant Fitness Model

Sarah Stage is a gorgeous, super fit 30-year-old model who happens to be eight-and-a-half months pregnant, not that it's easy to tell.

NEWS: Maternity Couture: The Best-Dressed Bumps of 2014!

Stage has become an internet sensation over the course of her pregnancy, posting a slew of photos to Instagram chronicling her development. Her fan base has grown exponentially since she started documenting her pregnancy.

Sarah Stage skinny pregnant model
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Model Sarah Stage stays so fit you can barely tell she's 8 1/2 months pregnant
Can we talk about how this @shopflynation bikini is only $20?! 🙀 #postpartum #MomLife
My everything 💞 photo: @funkyfreshkids14
James Hunter (4/14/15) 8.7lbs/22 inches of HEALTHY baby! 😋👼 Thank you for the positive support throughout my journey... It's just beginning!!! #JamesHunter #Healthy
4 days post baby 🐣 . Total pregnancy weight gain was 28 pounds. I'm excited to resume my workouts in 5 weeks!! #JamesHunter #HealthyBaby #GrannyPanties. #postpartum
Hi 🐨 tan by @bondisands #34weeks
Eek officially 81/2 months... And he's now 5lbs 🐻 #34weeks
Can't wait to meet him 😊(used @bondisands for tan) PHOTO: @krishphotos #8monthspregnant
Excited for baby shower tomorrow 🐰 ❤️ #8monthspregnant r
Last week w/ @krishphotos 🐰#8monthspregnant
Good morning ☕️ lil chunker is almost 5 lbs 🙈 #33weeks tomorrow.. #8months
Good morning ☕️ finally got that Aussie tan 🐨 @bondisands 🐨 #preggo (photo: @dplyusnin) #8monthspregnant #7monthspregnant
It's a wrap! Quickest shoot ever 🐰 #32weeks
Shooting with @krishphotos 💞 #8months #32weeks
🐣 8 months this week 🐣
Woke up to a lot of #wcw love.. Just wanted to say thank you from me and baby 😘 #29weeks
@sunsetblonde and i showing off our baby bumps yesterday 👶👶 #33weeks #29weeks 🌊

So how does a woman who is about to give birth seem to have no baby bump at all? Stage has managed to stay slender through a strict exercise regime and practices a healthy diet.

The Los Angeles-based fitness model doesn't keep herself from indulging occasionally. According to her Instagram posts, she treats herself with In-N-Out burger, but only occasionally.

Aside from her many pics in bikinis, lingerie and work-out gear, Stage has also bared it all, going fully nude to show off her tiny baby-bump.

For more fun baby news, check out the video below for a look at the best celebrity pregnancy announcements.

Cutest Celebrity Pregnancy Announcements of 2014

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