Prince William and his fiancee, Kate Middleton, lunched with her sister at a London restaurant this weekend. The trio turned up at Mosimann’s in Belgravia on Sunday, the Daily Mail noted, following a News of the World report (the original article is behind a subscription wall).

The prince was dressed casually in a dark blue sweater, khakis and sneakers, and the paper noted that the restaurant requires a jacket and tie for dinner. Kate wore a black skirt, tan kitten heels and what looked to be the same light brown jacket that she sported last month at lunch with Camilla, duchess of Cornwall. Kate’s sister, Pippa, is her maid of honor, and the three, who reportedly dined in a private room, were thought to be discussing the upcoming royal wedding.

People interested in trying to spot the royal couple in London, or simply heading to the British capital for the wedding next month, can follow suggestions in this weekend’s New York Times London travel article.

And those who liked the interactive map of the route of the royal wedding procession might check out (courtesy of the Telegraph) Google’s 3-D map.