The pair got married in September 2012 at a ceremony in Rome and have two children together.
In a joint statement to the PA news agency, the couple said: “We have taken the decision to end our marriage and are now separated. There is no other party involved.
“We will continue to be united as loving parents to our children and would therefore kindly ask for our family privacy to be respected.
“There will be no further comment.”
Cat Deeley and Patrick Kielty announce split
Deeley is best known for presenting This Morning alongside Ben Shephard but has previously hosted the likes of SMTV Live and So You Think You Can Dance.
Shephard and Deeley presented their first show as the new permanent presenters of This Morning in March 2024.
The duo took over from Holly Willoughby and Phillip Schofield, who co-hosted ITV1’s flagship morning programme together for 14 years before they both left in 2023.
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Deeley rose to fame as a presenter of Saturday morning ITV children’s programme SM:TV Live alongside Ant and Dec, and its spin-off music programme CD:UK with Willoughby.
She is also known for hosting ITV’s Stars In Their Eyes, the BBC’s Fame Academy and American competition show So You Think You Can Dance, which she presented for more than a decade.
Kielty is a comedian and presenter known for hosting The Late Late Show on RTÉ One and presenting the Saturday morning show on BBC Radio 5 Live.