Last year, Katy Perry married an Englishman (Russell Brand) -- and she was primed and ready to mock England's most famous sisters as guest host on Saturday Night Live's all-new episode over the weekend.

In the royally-inspired skit, Kate Middleton (played by Abby Elliot) gets grilled by Queen Elizabeth (Fred Armisen) and Prince Philip (Bill Hader) for failing to get pregnant with a royal heir eight months after the royal wedding.

After Elizabeth and Philip get downright vulgar with defenseless Kate, the Duchess gets an assist from another palace visitor: scene-stealing sister Pippa, played by Perry, 26!

As the stylish bachelorette with the famous derriere, Perry reveals a new side to Pippa: trash-talking, cockney-accented brawler!

Check out Perry's Pippa impersonation now in this skit.