Paris Hilton & Kim Kardashian might be Petra-fied of a new import who could knock ‘em down a notch on the social ladder, and for good reason.

Meet Petra Ecclestone -- she’s obscenely rich, strikingly-beautiful, a fashion trendsetter -- and L.A.-bound!

Ecclestone, 22, is a gorgeous blonde from England who made big news this week in plunking down upwards of $150 million