She wrote: “Thanks you Father Christmas Idris Elba for inviting me along to visit some very special children and nurses and doctors today at the hospitals best surprises ever! Until next year!!!
“Special thanks to Chelsea and Westminster Hospital and Evelina Children’s Hospital.”
The British vocalist sported an oversized red outfit with a protruding belly.
Elba, who was recently named sexiest man alive by People magazine, wore a long, white beard and white gloves as the pair posed together.
Ora, who last month released her second album Phoenix, also shared a photo of Elba clutching a bottle of champagne. In another snap she is seen holding a sack of presents.
Rita Ora and Idris Elba deliver Christmas presents to children in hospital
