Beyonce Knowles is losing out on hours of beauty sleep - because she's addicted to staying up late and watching fans perform her famous dance moves online.

The success of Knowles' catchy tune Single Ladies (Put a Ring on It) blew up when the star shook to the beat in her new music video, wearing only a body-hugging leotard and high heels.

The singer found her inspiration after stumbling across a clip of a 1960s Bob Fosse routine called Mexican Breakfast on  youtube.

 And now she can't stop surfing the net for spoofs.

She tells OK! "It's beautiful, it's amazing and I love it! I stay up all night watching them."