The couple got married last August after five years together and Nicola announced her pregnancy five months later.
Nicola joined the Made in Chelsea cast in 2015, when she was dating co-star Alex Mytton.
She made her exit one year later following their break-up – and it was Alex who introduced her to Charlie.
The Dubliner is now a model and social media influencer who has celebrated how “very normal” her husband is.
"Charlie isn't in the reality world. He's a very normal guy. He has a recruitment company in the city. He's a lovely guy,” she told the Daily Mail.
The couple are based in the UK but planned to fly back to Nicola’s native Ireland to have baby Penelope.
The 32-year-old told of her experience on her Instagram Stories in July, saying that she was “so happy” that the baby would be born at home.
Sharing a photo of her taken before her flight into Dublin, she wrote: “Bump’s growing by the day! I just had my first midwife appointment in Ireland and I’m so happy we’ve decided to have the baby here.”