The BBC Radio 1 DJ and 'RIP' singer will appear alongside returning judges Cheryl Fernandez-Versini and Simon Cowell for this year's singing competition.
© Channel 4
© Getty Images / Ian Gavan
Voice UK coach Ora said: "I am excited to be coming back to The X Factor - I had a ball here in 2012. This is a journey I can't wait to embark on to find some talented singers. It's the new generation taking over. Boom!"
Grimshaw added: "I love X Factor and have watched the series religiously since it started, so obviously I'm hugely excited to be joining the show.
"Music is my job and my passion and I'm really looking forward to seeing what talent we can find and nurture this year. I can't wait for Judges' Houses in Oldham!"
It was wildly rumoured that the duo would be replacing show icon Louis Walsh and last year's judge Mel B, with Walsh himself admitting that there was a "great, great chance Grimmy will get [his] job".
© PA Images / Ian West
Fernandez-Versini, who returns to the panel for her fifth series, said of the new line-up: "I haven't been as excited about an X Factor season since I first became a judge.
"The addition of Rita and Grimmy along with some interesting changes we've made to the format has refocused us to do what we do best, finding talent and making stars. I cannot wait to get started!"
Show boss Cowell added: "It's taken a while! But I am very happy to be able to confirm our line-up of judges for The X Factor this year. The combination of Nick, Cheryl and Rita is going to be a lot of fun! They all bring a lot of enthusiasm and passion for music to the show.
"I have a feeling I am in for a bit of a rough time but sometimes you have to embrace the craziness and now, with luck, we hope to find a star."
Before the news was officially announced, 75% of DS readers taking part in our poll said judging panel.
Ora rece! ntly appeared as a coach on rival , and first appeared on The X Factor in 2012 as a guest judge.
The X Factor returns to ITV in autumn.
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