The Bachelor 2015's Sam Wood and Snezana Markoski are expecting their first child together.

Sam broke the news on Instagram on Sunday night. They are the first couple from the TV dating series to announce a pregnancy.

In the accompanying photo, Snezana showed off her growing baby bump.

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Announcement: The Bachelor 2015 couple Sam Wood and Snezana Markoski are expecting their first child together

'She is having a BABY!' Sam made the announcement on his Instagram account on Sunday

In Sam's Instagram post, a smiling Snezana is dressed in a white T-shirt with a bowl of pasta in her lap.

With a excited expression on his face, Sam points to her baby bump.

He wrote in the caption: 'Snez... a) has just eaten a bowl of pasta bigger than her head, b) can't do up her pants, c) is having a BABY!!! d) all of the above'.

Later, Sam revealed on Facebook the couple were expecting a baby girl.

Happily ever after! The couple met on the third season of The Bachelor Australia

Loved up! Three months after the show's finale, Sam and Snezana got engaged

The couple met on the third season of The Bachelor and got engaged three months after the show's finale.

Fans reacted with overwhelming joy, taking to Instagram to congratulate the pair.

A fan wrote: 'Congratulations to all three of you, this is freakin' awesome. Next year Sam you will be running at the Mother's Day Classic with a pram.'

Another commented: 'Yay you guys! Little 28er - time for 28 onesies xxx'

The first Bachelor baby! Fans took to Instagram to congratulate the reality TV couple

Happy family: In the past two years, Sam has taken on a stepfather role to Snezana's 11-year-old daughter Eve (pictured)

Family: Snezana and Eve moved from Perth to Melbourne to live with Sam in July 2016

In July 2016, Snezana and her 11-year-old daughter Eve moved from Perth to Melbourne to live with personal trainer Sam.

Over the past two years, Sam has taken on a stepfather role to Eve and the couple have previously talked about having children together.

In a previous interview with OK! Magazine, Snezana confessed she 'welcomed the idea of having children' with Sam.

'I did have a feeling whoever was going to be the Bachelor would be keen to start a family,' she said.

Clucky: Snezana previously said she 'welcomed the idea of having children' with Sam

Bonding: Snezana also revealed she was hoping to give her daughter a little brother one day

All smiles: 'I did have a feeling whoever was going to be the Bachelor would be keen to start a family,' Snezana said in a previous interview

Snezana also told Who magazine she was hoping to give her daughter a little brother one day.

'(Eve) kept saying, "Oh mummy, you might meet somebody and it's a once-in-a-lifetime opportunity. And even if you don't, at least you tried",' she said.

Earlier in the year, Sam told KIIS FM's The Kyle And Jackie O Show they were planning to get married in Europe next year.

'Snez is in full swing getting things organised,' he said. 'We're going to get married overseas. We just want our immediate family and closest friends.