Tweeting about the appearance, Miss Wilde wrote, "Cowboys screening for 8,000 in the Piazza Grande a the Locarno Fest tonight. prepping my speech in Swiss, Italian, and Apache just in case."
Realizing that there isn't such a thing as a Swiss language, the 27-year-old actress later posted a message reading, "oh good, turns out there's no Swiss language. that makes things simpler. i'll throw in Cantonese just to keep things interesting."
The Locarno appearance comes as "Cowboys & Aliens" continues to fare well at the box office - as it's currently in third place this weekend with a projected two week take of $66 million.