The evolution of Zellweger's rail-thin silhouette is reported to be a result of daily two-hour workouts and 12-mile hikes in the Hollywood Hills.

Her painfully thin look is a dramatic about-turn for the star who famously had to gain two stone for role in Bridget Jone's Diary and the 2004 sequel The Edge of Reason.

At the time she said: "One doughnut does not do a thing. You've got to eat 20 a day for at least five weeks to get results."

Let's hope Bridget Jones author Helen Fielding starts work on a new instalment immediately, before Renee disappears altogether!