The 'Shine Ya Light' singer shared the celebratory snap with fans and appeared to pose topless as she protected her modesty with a large black cushion.
Rocking her short cropped hair and blunt fringe, an excited Rita said: "Birthday girl!! Today I'm allowed to be A F***ING STAR! Thank you everyone for the birthday wishes and I love you!!!!"
Rita, who is dating DJ Calvin Harris, wore red lipstick and blue eye make-up, and looked fierce as she pouted for the camera.
The excitement for the birthday girl kicked in a day early though, as she proudly showed off a pair of black mesh cut-out Louboutin heels on Monday (25 November). Lucky girl!
Rita suffered a difficult past week after she was rushed to hospital for heat exhaustion and dehydration while on set of a photo shoot for Madonna's clothing line, Material Girl.
After coming out of hospital, Rita admitted to fans that the ordeal left her "scared" but said she was "on the road to recovery".
Watch Rita's music video for 'How We Do (Party)' below:
Check out some behind the scenes pictures of Rita Ora's Material Girl shoot in London:
Copyright: Material Girl