Sister Little Syndrome; Serena Williams Is Fixated with Beating Venus. Dannii Minogue Wants to Be More Famous Than Kylie. and We All Know about Pippa. What IS It with Little Sisters? SASHA SLATER (Who's One Herself) Owns Up

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Byline: by Sasha Slater

BY ANY reckoning, this should have been the month when Kate Middleton was enthroned as Britain's unrivalled icon of style.

Yet a fortnight on from that glorious wedding, whose face adorns the cover of no fewer than five celebrity and fashion magazines, from Grazia and Heat to Hello!? It's not Kate's, but Pippa's.

Even at the wedding, it was Kate's head that wore the tiara, but Pippa's bottom that caused an internet sensation.

Then there were the leaked holiday snaps on a boat in Ibiza, taken in 2006, that invited even more praise for Pippa's perfect posterior.

Aside from admiring the Middleton sisters' fabulous figures in their white bikinis, you might have spotted that while Pippa dived in a graceful arc backwards off the yacht, Kate watched from the sidelines, keeping a tight grip on the safety rail.

Whisper it, but it would seem that Her Royal Hotness has stolen more than a little of her older sister's limelight.

In the House of Windsor, you don't have to look far to find another naughty little sister who is sexier, prettier and more redblooded than her staid older sibling. Princess Eugenie, an archetypal younger sister, startled her teachers by frolicking …