The Love And Other Drugs star took on the role of Kate Middleton in a sketch that saw the new fiancée of Prince William meeting The Queen and Prince Philip at Buckingham Palace.
The segment opened as The Queen (Fred Armisen) and Prince Philip (Bill Hader) expressed their delight at having Middleton join their family, before the introduction went downhill when Prince William (Andy Samberg) was called away to another room.
The Queen and Prince Philip then switched to heavy Cockney accents and questioned why Middleton wanted to join their clan. "You think you can just show up and take over and do a bit of Queening?" said The Queen, while Prince Philip wondered if she wanted a "piece of our palace action".
The Queen then said she needed to learn the rules of marrying into royalty, while Prince Philip said it wasn't like learning about the appropriate cutlery in The Princess Diaries, a reference to the movie which Hathaway starred in.
Among the lessons they taught her were not asking were things came from ("Most likely we nicked it," said Prince Philip) and taking delight in calling for servants, only to tell them to go away without any further instructions. The Queen also advised Middleton to "drop the 'Your Majesty' stuff and call me Debra" and told her she'd never escape her because her face is "on all the money".
The sketch ended as Prince William arrived back to escort a shocked looking Middleton to their press conference while The Queen and Prince Philip appeared to embark on a wrestling bout.
Saturday Night Live continues next Saturday at 11.30/10.30c on NBC with Robert DeNiro as the guest host and Diddy-Dirty Money as the musical guest.