The Sunday World can exclusively reveal that the Galway-born presenter has signed up to be one of the 12 celebrities drafted in to kickstart the 2022 series of the hit show after it was cancelled earlier this year due to the pandemic.
The previous season was shortened and tweaked when the outbreak interrupted filming, leading to 2fm DJ Lottie Ryan and her professional partner Pasquale La Rocca lifting the trophy a week ahead of schedule in a revised format.
This season will see lots of changes on set as audiences will be prohibited from attending in the early stages of the competition with options to introduce reduced and socially-distant seating later in the series.
Grainne has been off our screens for a few years while she put all her time and attention into her successful diamond company, but it wasn't that long ago that the 48-year-old star was the face of some of our biggest shows on TV.
Her impressive CV boasts working at RTE One, BBC One, Sky News, Virgin Media and TG4, where she got her big break as the original news anchor from launch night on October 31, 1996. She went on to launch Virgin Media and Sky News Ireland too.
The Spiddal gaeilgoir moved to South Africa in 2016 where she started her business Grace Diamonds before returning to Ireland a few years later and marrying Leon Jordaan in December 2019. She has a 20-year-old son Conall from a previous relationship.
Due to the Covid crises, there have only been four series of DWTS so far, meaning Aidan O'Mahony (2017), Jake Carter (2018), Mairead Ronan (2019) and Lottie Ryan (2020) are the only Irish stars to lift the coveted trophy.
The Shinawil production is widely regarded as one of the best 'reality' shows ever produced on Irish TV and was sorely missed by RTE and by fans earlier this year.
There has been lots of speculation in recent days about who will be named in the line-up with Ronan Keating's daughter Missy due to take part.
She is expected to be joined by RTÉ newsreader Aengus MacGrianna, comedian Neil Delamere and Paralympic athlete Ellen Keane.
Both Jennifer Zamparelli and Nicky Byrne have also both been confirmed as presenters for the next season. They have fronted the show since season three when Zamparelli replaced the original host, Amanda Byram.
There is, however, a change to the judging line-up with Julian Benson replaced by American-born professional dancer Arthur Gourounlian, who will take his seat alongside seasoned judges Brian Redmond and Loraine Barry.
Irish fans may recognise Arthur from Big Brother star Brian Dowling's social media posts as the pair married in the Powerscourt Hotel in 2015.
Dancing with the Stars is due to start on January 9 and run for 11 weeks but both RTE and Shinawil are believed to have several contingency plans in place in case the ongoing Covid crisis changes.
We contacted RTE last night to verify Seóige's participation, but they refused to confirm it.