The 30-year-old Let You Love Me hitmaker looked incredible as she judged the third episode of the quirky ITV competition in the fluffy garment.
Rita flaunted her smoking-hot figure in the teeny strapless frock, her hair tied in a stylish up-do.
She burst thermometers with her gorgeous makeup as she wore long feathery eyelashes and glossy lipstick.
The How to Be Lonely singer finished the iconic look with some killer yellow heels and glamorous pearl earrings.
Rita took to Instagram to share a string of snaps with her 16million followers as she oozed glamour in the fabulous outfit.
The first pic saw her beaming at the camera with her hands on her waist as she got ready for The Masked Singer filming.
She applied some lip liner in the second snap as she pouted away from the camera in the sultry photograph.
In the third snap, Rita gave viewers a glimpse backstage of the ITV show as she walked alongside the dressing rooms with a hot drink in one hand.
The fourth saw Ora pose up a storm behind the scenes of the show as she smouldered with her back towards the camera to show off her fabulous dress.
Her devoted fans went into meltdown after seeing her dress, showering the star with compliments and adoration.
One said: "Girl you look amazing".
While another gushed: "YOU’RE SO CUTE".
"I love your outfit, Rita!! so pretty", penned a third.
A fourth wrote: "Beautiful babe".
Her The Masked Singer co-star Davina McCall commented: "You gorgeous woman", with a kiss and smiling emoji.
The Masked Singer airs Saturdays at 7pm on ITV.