It takes a very special sort of fitness regime to keep Jack Nicholson in his current shape.

Exercise One: Take an extra-large baguette stuffed with your favourite filling and raise it to the mouth. Lick lips. Eat.

Exercise Two: Wash it down with a Diet Coke.

Exercise Three: Light up a cigarette. Exercise Four: Do some gentle stretching exercises (not too vigorous, now) watched by bikini-clad lovelies.

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Ladykiller Nicholson lets it all hang out in the South of France

Result: One of the most impressive manbooband-belly combinations currently to be seen in the Mediterranean sun.

Nicholson, 70, has always enjoyed the attentions of the fair sex and he was in his element aboard a speedboat off Saint Jean Cap-Ferrat, in the South of France.

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(1) Crust of a wave: Big Jack gets to grips with supersize baguette (2) But rather than wash it down with booze, he opts for a sober Diet Coke

(3) Tobacco, however, is still one of his many vices (4) Then it's time to burn off the odd calorie with this gentle stretch, earning the admiration of his companions below

At one point he dived smoothly into the water before struggling to haul himself back on board.

But basically, all play and no work makes Jack a happy boy, and he eventually settled down for a soothing nap.

The three-times-Oscar-winning actor, who revels in his hellraising image, was married once, to actress Sandra Knight, but they divorced after having a daughter, Jennifer.

Jack gets to grips with the speedboat before doing a few stretches

Among his other numerous lovers are the actresses Anjelica Huston, Rebecca Broussard, with whom he had two more children, and Lara Flynn Boyle, who is more than three decades his junior.

His popularity with younger women might not be entirely unconnected, some cynics suggest, with the fact that he has a fortune estimated at £140million.