There were a couple reputable twitter sightings of Natalie yesterday. Town and Country Magazine tweeted

Fitting that Natalie Portman is wearing Giambattista Valli and the menu is vegetarian. How chic?

An earlier tweet suggests that maybe it was a part of a Dior event.

Winding back the clock and it appears that Natalie was doing some shopping earlier in the day, according to this tweet.

Spotted: Natalie Portman selecting a gown for the Spring 2012 NYC Ballet Gala.