Ashton Kutcher, an investor in Airbnb, Uber, Spotify, and star of the Steve Jobs flick “Jobs,” knows his tech. “He knew everything there was to know about everything that was going on, even historically, about the technology we used,” director Joshua Michael Stern told us at the Wall Street Journal-hosted premiere at MoMA Wednesday. “I walked onto a set once and there was a computer processor that was there as set dressing and he removed it and said, ‘This wasn’t invented for two more years.’ ” Karlie Kloss and her boyfriend Josh Kushner, Arianna Huffington and Dennis Crowley attended the after-party at Forty Four at the Royalton.