After nearly stealing the show at Buckingham Palace a couple of weeks ago, Pippa Middleton has risen to popularity fast, becoming even more wanted than Kate's Alexander McQueen gown.
Friends of the sisters say they grew up as best friends and are very close, but the two have their share of sibling rivalry.
"There is a healthy competition between the two," royal correspondent Katie Nicholl says. "Certainly when it comes to looks, like who is the slimmest or better looking, there is a little friendly rivalry."
That's understandable. But it gets weirder.
"You'd see them fight over who had the worst headache or period pain," a family source reveals.
And while Kate gets to carry the title of Duchess, it's arguable that Pippa may actually have it better, because she's royalty by default. She's a princess who still gets to party. And that's a role she's familiar with.
"None of the guys noticed Kate," another source says. "[Pippa] dated a couple of the St. Andrew's lads and tried to get in with a lot of William's friends," the source says. "She wasn't sleeping around, but she flirts with the most well-connected men."
After seeing photos of Pippa dancing in her bra, that's not hard to believe.