USMagazine, Wednesday, May 11, 2011, 11:00am (PDT)
Good-natured scene stealing is nothing new for Pippa Middleton.
Although Duchess Kate and her suddenly-famous younger sister and Maid of Honor, 27, are "best friends" according to one family friend, that doesn't mean they're unlike most siblings. "There is a healthy competition between the two," royal watcher Katie Nicholl says in the new Us Weekly.
"Certainly when it comes to looks, like who is the slimmest or better looking, there is a little friendly rivalry."
Kate, 29, and Pippa squabble over "weird things," says a family source. "You'd see them fight over who had the worst headache or period pain!"
And it's no wonder that Pippa has grabbed headlines for her sexy, elegant style, her chemistry with Prince Harry during the royal wedding -- and startling pics of her partying in a purple bra and a white bikini.
Indeed, as fellow students at posh boarding school Marlborough College, "none of the guys noticed Kate," a source says. When Kate began attending St. Andrews in Scotland (where she met Prince William), Edinburgh student Pippa frequently visited to mingle with her sister's noble new pals.