Danielle Lloyd is beautiful - and, as Guy Dr Maupassant, the French nineteenth century author observed, in his day, women have no class - their beauty is their class, and with it they can marry into any social circle and open any door. It was how he saw it, and it is certainly true of his time.
All those models photographed wearing expensive jewellery for ads, and for expensive perfume campaigns, and fashion cat walk models, like Twiggy ..if they opened their mouths, they would sound ordinary - just cockney or northern working class, but they look like aristocrats and sell the notion of superior refinement. Take your pick of famous beauties who always pull rich husbands, they look like a million dollars and could pass for royalty. It is often their beauty which makes them look elegant. That's what beauty does.
I'm not taking 'classy' to mean 'refined' , ' well-bred', or 'sophisticated' in intellect or values. The origins of the word have nothing to do with morality or kindness The term was mostly used in the 1960s, 70s by men to describe a chick they are dating who looks a bit sophisticated. To men, with their sexually-focused viewpoint, this means very sexy with a slightly more glamorous or poised look, a midi skirt with a thigh-high slit, instead of a mini with a side split. Big hair will be sprayed into place, and carefully painted nails will match patent high heels. Men being men, the ' classy date' will still have a low-cut top, but will wear a neck scarf atop the cleavage. The car she drives will be relatively expensive - and probably red, to match her nails.
I think 'classy' is a naff word, as others posters have said. 'Stylish' might be better.