Bachelor in Paradisestar Alex Nation is expecting her first child with her boyfriend Carson Jory.

The 28-year-old shared the exciting news in an Instagram post on Sunday night, alongside a photo of her holding her baby bump.

"I wonder if you’ll have your Father’s eyes? Will you be stubborn like your Mother? See you soon little darling," she captioned the post.

Alex, who already shares her son Elijah with her ex partner, only just announced her relationship with Carson on Instagram in December.

"Nice to meet you Mr Jory," she captioned a series of black and white photos of the couple.

She also shared a photo of her and Carson looking very cute together in an Instagram post earlier last month.

But aside from a handful of Instagram photos, Alex has kept her relationship with Carson quite private.

Here's everything we do know about her past relationships.

Becoming pregnant at 19.

Alex was 19 when she fell pregnant with her son Elijah after having a fling with her boss from work.

"Elijah was a one-night stand baby," Alex told fellowBacheloralum Laura Byrne on Mamamia'sMe After Youpodcast. https://www.mamamia.com.au/podcasts/me-after-you/

"We had an office fling and it was just one night [after a work party]. One night of flirting, passion and excitement. Six weeks later, I found out I was pregnant."

"We weren't dating or anything. So we had to get to know each other and learn to love each other over the course of the next nine months for Elijah. It was a completely different ball game. The biggest whoopsie, but the best whoopsie."