Last night Thor: The Dark World star Natalie Portman stepped out with a dark new look. The actress debuted freshly-shorn chocolate tresses at a screening of the film in New York City, hosted by The Cinema Society and Dior Beauty. "We just did it today! You can probably still smell my dye if you get close enough," Portman told InStyle.com of her new locks, done by hairstylist Danilo. "It was like, twenty minutes before I got here." Dressed in head-to-toe Dior except for a Charlotte Olympia lucite clutch, she joked about the army of people it takes to get her ready for an event. "A lot of people built this facade," the actress shared. One of those people was makeup artist Pati Dubroff — who used only Dior Beauty products on Natalie — including Rouge Dior lipstick in Rose Baiser ($34), Diorshow Fusion Mono eyeshadow in Aventure ($30), and Diorshow Blackout mascara ($25). We are loving her sophisticated new look! One of Natalie's favorite moments from filming the movie? "I got to slap both Tom (Hiddleton) and Chris (Hemsworth) in the face, which was a highlight for sure!," she stated about her co-stars who play Loki and Thor, respectively. "We had a lot of fun working together." Be sure to check out Thor: The Dark World, in theaters everywhere tomorrow. MORE:• See All The 2013 Celebrity Hair Makeovers• Natalie Portman Gets Ombre Highlights• Go Inside The New York City Ballet Fall Gala With Natalie Portman and More!