Model Sarah Stage flaunts six-pack abs at seven months pregnant

You wouldn't guess that Sarah Stage is seven months pregnant with a baby boy.

The 33-year-old US fitness model showcased her barely-there baby bump, revealing a six-pack in her latest Instagram post.

On Monday, Sarah spent time at the beach sunbathing in a pretty, pink bikini.

"#7monthspregnant & enjoying the sun," she captioned the photo.

Sarah is in her third trimester and twenty-ninth week of pregnancy. On July 21, she revealed the baby was weighing in a little over 2lbs [0.9kg].

Last week, the Californian shared a selfie to social media, posing in front of a mirror in a green two-piece swimsuit.

"Hello #thirdtrimester!" She captioned the post, on July 31. "These past #7months have flown by. Trying to stay in the moment & enjoy every second since we don’t plan on having any more babies after this one!!"

Sarah, who is already a mum to two-year-old son, James, has been criticised for her tiny bump and muscular frame in the past.

In 2015, when pregnant with James, she was body shamed by people concerned by her lack of a traditional "pregnancy body".

And now, with her second baby on the way, she's clearly facing the same criticisms again.

"I would think that after having James, who was born almost four kilograms and healthy, people would be more understanding during this pregnancy," she wrote on July 12.

But the expectant mum doesn't let it bother her, instead choosing to spread positivity.

"We are all different and that's what makes us special and unique" she wrote, adding, "Baby #2 is healthy and measuring just fine."