Rita Ora flashes underwear while celebrating birthday

British singer Rita Ora was left red-faced after accidentally flashing her underwear while celebrating her birthday in a revealing dress.

The R.I.P. hitmaker turned 23 on Tuesday (26Nov13) and she marked the occasion by enjoying an intimate dinner with her DJ boyfriend Calvin Harris before hitting London's Box nightclub with a host of pals.

However, the star's daring red gown, which was cut low and had a long split in the middle, proved to be quite difficult to control. Ora ended the night with an embarrassing glitch by accidentally flashing her white underwear to waiting photographers as she walked back to her car.

Before the celebrations began, Ora took to Instagram to share a topless snap of herself, covering her breasts with a pillow, which had "I'm a f**king star" emblazoned across it.