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Mischa ups style stakes as stars pose at garden party

IRISH-american actress Mischa Barton (far left) was the star attraction as London kicked off its summer party season.

And she was joined in the style stakes by Australian singer Holly Valance (29), (above right), and Jade Jagger (left) at The Serpentine Gallery Summer Party in Kensington Gardens. Amber Le Bon (above, left) -- the 23-year-old daughter of Duran Duran star Simon Le Bon and wife Yasmin -- showed how she's stepped out of their shadows as she posed for pics.

Not looking so good was Nancy Dell'Olio, former partner of ex-England footballer manager Sven Goran Eriksson, who wore a bizarre Egyptian outfit.