The presenter revealed on Instagram that she is pregnant, with the baby due in early 2021.
Posting a picture featuring a babygrow bearing the logo of Guns N’ Roses and the song title Sweet Child O’ Mine, she wrote: “I’ve always tried to be protective over the personal side of my life. A lot of things are just for me and my loved ones, and we’ve chosen not to share publicly.
“However I want to now share good news as it’s our news to share – and I’m gonna be honest it’s starting to look like my lockdown beer belly is out of control. Iain and I are expecting a baby early 2021. It’s been hard to keep such happy news quiet.
“Especially the times when I’ve had to run out of live radio to get sick in a bin or my penchant for a bowl of mashed potato in the morning.
“I wasn’t hungover like everyone thought. In fact I was completely sober filming the entire series of Celeb Juice, which is quite the accolade!
“We’d appreciate our privacy respected but just wanted to spread some love and a reminder of the beauty of life.”
Laura’s post followed tabloid reports that she and Love Island narrator Ian had recently got married.
The pair met at a TV awards ceremony in 2016 but did not get together until later.
Laura worked alongside Iain on the most recent series of Love Island in January, after succeeding Caroline Flack as the ITV2 reality show’s presenter.
The couple have also appeared on Celebrity Gogglebox together.
Comedian Ian shared his own post about the announcement, posting a picture of his gaming consoles on Instagram with a note reading “I will miss you”.
He captioned the picture: “Sorry to my old babies but there is a new baby coming early 2021.”
Scarlett Moffatt was among the stars congratulating them, commenting on Laura’s Instagram post: “Congratulations to you both honestly you will make the most wonderful parents xxxx.”
Dermot O’Leary wrote: “The best news. Congrats x.”