Published Thursday, 12 June 2014
Caroline Flack hosted The Xtra Factor for three years. (© Getty)
The 34-year-old, who joined the programme in 2011, broke the news on Twitter.
She wrote: "After three brilliant years of hosting Xtra Factor it's time to pass the baton. It's been incredible and I'll never forget it."
She joked: "How can I when I am married to Louis Walsh? It's all he ever talks about at home.
"I wish the new team all the best and look forward to watching the new series."
The Xtra factor will now be hosted by BBC Radio 1Xtra DJ Sarah-Jane Crawford.
Speaking of her new role, Sarah-Jane said: "I've been a huge fan of The X Factor since day one and have watched every series religiously, so to be the new host of The Xtra Factor in its most exciting year ever, is what dreams are made of.
"I'll be asking the judges the questions that people at home are screaming at their TVs - and you'd better believe I'm going in with a bang! I just can't wait to get on the road now and meet the auditionees."
The show's executive producer, Mark Sidaway, said she was "a great addition to the team".
He added: "She has fantastic knowledge of the music scene and has interviewed some of the biggest names in the business, so will be brilliant at digging out all of the gossip from the judges and contestants. She also has a great sense of humour...a must for the show."
There has been no official announcement as to whether Flack's previous co-host Matt Richardson will be returning for a second year, but he has suggested he is not after taking to Twitter to congratulate Crawford on her new post.
He wrote: "Major Congrats to (Sarah-Jane) on xtra, I shall remember it well whilst writing my new tour. Advice: Judges Houses is not a holiday (it is)!"
On Wednesday it was announced former Spice Girl Mel B would join The X Factor judging panel alongside Simon Cowell, Cheryl Cole and Louis Walsh.
Dermot O'Leary will also return as host of the main show.
The X Factor returns to UTV later this year.
© UTV News