The 'I Will Never Let You Down' singer has taken over from Kylie Minogue, who announced earlier this year that she'd be leaving the show after one series.
She will be joined in the big red chairs by regulars Tom Jones and Will.i.am, and Kaiser Chiefs frontman Ricky Wilson - who has now officially signed up to return, contrary to rumours that he was also set to quit.
Ora's appointment was announced with a post on The Voice's official Twitter account, which read: "We're stupendously excited to introduce our Ora-some (hmm) new coach for series 4 of #thevoiceuk... @RitaOra!"
The popstar commented: "I’m so excited to be part of; and for my team to win The Voice this series!! Let's have some fun Will, Tom and Ricky! [I’m] looking forward to the blind rounds – and spinning in my big red chair. EXCITED!!!!"
Meanwhile, Wilson said of his comeback: "I enjoyed spending last winter with The Voice, it's definitely fun to be part of a show with a spinning chair. I hope Rita likes it too… I'm sure the audience will love her."
Will.i.am added: "Tom Jones is our rock, Ricky is awesome and it’s our pleasure to welcome the very talented Rita Ora. Rita is sweet, spicy and sassy - she’s going to be a great addition to the team."
Ora - who's signed to Jay Z's record label Roc Nation - has achieved huge success in just two years on the music scene, including four number one singles and a chart-topping debut album in the UK.
She has also dabbled in acting, landing roles in Fast & Furious 6 and the upcoming big-screen adaptation of Fifty Shades Of Grey.
The Voice UK begins filming its latest Blind Auditions in Salford next week, with the new series set to hit our screens in January.