The Voice coach took her artists Karis Thomas and Joe Woolford to a gig featuring popstar pal Charli XCX.
But all attention was on Rita as her all black ensemble left little to the imagination with an unfortunate wardrobe malfunction leaving the singer exposing far too much.
While Rita may have been left rather red faced by nipple-gate, both Joe and Karis seemed to enjoy the surprise night out.
On Twitter, Joe tweeted: "@charli_xcx @RitaOra tonight was so good!! thank you so much to the best coach ever for inviting us!! "
Karis has posted online earlier in the evening: "Suprise night out with our lovely coach @RitaOra ooooo where we going guys?? #exciting"
This weekend will see both Joe and Karis battling for a spot in the grand final.
As well as each singing another song live, they'll also be teaming up with coach Rita for a special group performance.
The Voice UK airs from 7PM on BBC One this Saturday night, with guest performances from Sia and Jess Glynne.
Browse pictures of The Voice 2015 semi-finalists below...