Renee Zelleweger looked skinnier than ever as she hit the red carpet for last night's Oscars ceremony.

Even her glittering silver gown failed to distract from the fact the actress appeared to have taken her pre-Oscars diet and exercise regime to extremes.

Fitness freak Renee – who attended the ceremony to present an award – is believed to follow a microbiotic diet, and work off the non-existent lbs with two-hour daily workouts with a personal trainer.

Unfortunately, as you can see in the picture above, the result of this gruelling routine was a red-carpet look that turned heads for all the wrong reasons.