The Duchess of Cambridge better hope what happens in Vegas stays in Vegas — because she's plotting a scandalous Sin City bachelorette bash for little sis Pippa Middleton!
"Kate has been tasked with planning her sister's 'hen do' ahead of her marrying British financier James Matthews next year," a royal insider spilled.
Pippa, 33, would be thrilled with a small "intimate affair," but publicly perfect Kate is really a girl gone wild — determined to throw a splashy Las Vegas extravaganza.
As Pippa readies save-the-date cards and mulls $20,000 designer wedding dresses, "Kate's inviting around 20 close female friends to the event," dished one snitch. "She's looking to book an entire floor at a five-star hotel for the celebration."
Kate wants to arrange for Britney Spears concert tickets, despite rumors of husband William's long-ago crush on the star, because she knows Pippa and her pals would love it, added the insider.
To what will no doubt be Queen Elizabeth's dismay, "there are whispers that erotic dancer Dita Von Teese will perform a special show," tattled the source. "Kate and Pippa have been to hen parties before with 'butlers in the buff.' It's thought they might have that, too."
Don't worry, though: Prince Harry — who was caught in a naked photo scandal in Vegas in 2012 — won't be expected to buff-buttle, and the spy assured, "Kate's planning for activities galore!"