The singer, 33, performed a number of her biggest hits on stage at the music festival located in Brockwell Park, south London.
During a performance of Anywhere on Sunday afternoon, Rita decided to head down to the audience to get them involved.
However in a clip uploaded to X, it showed that the Masked Singer judge struggled to get anyone to sing back her lyrics to her.
One festival-goer said on the social media platform: “Rita Ora trying to find ANYONE in the front row to sing her song acapella is one the best most embarrassing things I’ve ever seen omg then she sang the wrong song.”
Rita struggled to find someone who could sing the words, and then awkwardly starting singing a completely different song.
Despite the blunder, Rita looked incredible working it on stage.
She opted for a bright yellow coat before taking it off while singing.
The Girls songstress wowed in a white crop top, yellow hot pants and platform laced-up boots.
Rita styled her blonde locks into loose curls and completed the look with retro sunglasses.
The star also performed other hits such as Your Song, Hot Right Now, Lonely Together and Praising You.
It comes after Rita shared an update on her fourth album.
Speaking exclusively to The Sun’s Bizarre column in her dressing room backstage at a Mighty Hoopla Festival in London, Rita said: “The album is going really well.
“I’m taking it just one song at a time to be honest.
“I’m not sure it will be ready for this year though. But the great thing about my label {BMG] is that I have the time and they are really chill like that.”
Rita, whose new single Ask & You Shall Receive is out now, was with her husband, Hollywood film director Taika Waititi at the festival – who we spotted filming Rita’s set on his iPhone.
She used their relationship and their wedding back in 2022 to inspire her third album, You & I, but now Rita said she wants to go back to her fun-loving, carefree style.
“I’m a bit bored of that [my marriage] now [as inspiration],” Rita said.
“I want my music to move on, have fun and do what makes me feel good.
“If it doesn’t make me feel good, I’m not doing it, and I’ve found that very liberating.”