Is Hot Fashion Model Carla Bruni at that difficult age?

It might be love, but the French President has none the less been charmed by a woman who is a member of a clan with a very particular need for the trappings of power, says Celia Walden

You see them in London's ritziest hangouts, such as Bungalow 8, Cipriani's and Annabels, hungry eyes piercing through the low lighting as they scope out their next man.

They're the Euro-WAGs, international ex-models teetering on the brink of 40, with sexual CVs that read like the back pages of Paris Match and usually a couple of divorces beneath their D&G chastity belts.

Time, helped by money, has been kind, but these women are impatient to land the grand prize for the next phase of their life: the aged rock star with a house in St Tropez, the financier with a chain of hotels - or, failing that, the French President.

How deliciously predictable it is for the newly divorced Nicolas Sarkozy, 52, to be caught on the arm of 39-year-old Carla Bruni this week at Disneyland Paris. Just as his interest in the exquisitely beautiful model-turned-folk star is all too easily imagined, so is the intrepid Bruni's in Sarko.

Bruni is part of a distinct clan of modern Madame Bovarys who never quite seem to reach the summit of their romantic ambitions.

They want fame, of course, and those who haven't inherited want the wealth - but most importantly they want "the lifestyle": the high-profile friends, the gilt-edged party invitations, the feigned political and artistic interests. Already Bruni has made a none-too-successful recording of herself declaiming poetry, no less.

Euro-WAGs such as Liz Hurley, Elle MacPherson and Caprice will always describe their modelling careers as "digressions", although quite what the main thread is remains to be seen. In their late thirties and early forties, these women are at the peak of their physical beauty - which is to say, just before its collapse.

They keep make-up to a minimum and never wear especially short skirts or display too much cleavage, opting for Prada by day and leopard-print dresses paired with Louboutins at night.

As for the men on their arms, scarcely a Euro-WAG exists without serial swordsmen such as Eric Clapton, Mick Jagger and Arpad Busson featuring in their back catalogues. But once these women get to a certain age, their taste in partners mysteriously changes.

Bruni used to be involved with Donald Trump. The Spanish model Inés Sastre did roughly the same circuit before her fling with the admittedly charming but "you'd-have-to-think-of-the-handbags" golfer Colin Montgomerie.

But with their short or medium-term beauty, they are obliged to be long-term strategists, and as such invest as much discipline in the supervision and conservation of their prime assets as a businessman does with his books.

They might have slight weight issues masquerading as wheat or lactose intolerances, they work out religiously, take herbal mood relaxants, but - unlike their footballing counterparts - they avoid alcohol at all costs.

Such discipline has come at the cost of their girlish sensuality, leaving them brittle and insecure, though without the impetuosity that is the enemy of any good business plan. When appearing in the glossies, they gush about their lives at just the right tempo.

"I'm someone who likes the shadows, serenity, tranquillity," pleaded Cécilia Sarkozy - ironically, the epitome of the Euro-WAG and one whose dalliances we shall doubtless soon have laid out in the British press. "I never felt fame or power was important when you are in love," blathered Bruni.

Is there anything wrong with pursuing successful men? No, success has always been sexy. Yet the Euro-WAGs aren't really about sex: they're about an insatiable Becky Sharp-style hunger for power and influence.

Luckily for them, that's also what the men they target are about, too, since they can get the sex anywhere. And so perhaps, in a cynical, self-interested way, there really is a meeting of minds - but they would describe it as an uncontrollable love affair.

Sarkozy's fling with Bruni might not last, and do no more than raise a passing titter.

But he is, after all, a president, with a grand strategy for the renewal of his country that could involve ferocious confrontations with vested interests, not to speak of being one of three Western males with a finger on a nuclear button, and it does nothing for your confidence in his judgment.