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Ashton Kutcher seems like the type of guy who could pull a fast one on you any second, as he did for years on his now-defunct celebrity prank show "Punk'd." His public persona mirrors the character he's often reprised throughout his career: a lovable stoner-goofball with model good looks that dates back to his career-making turn as Michael Kelso on the long-running sitcom "That '70s Show." He's seen as a 32-year-old cad -- one who shares scantily clad pictures of his wife, actress Demi Moore, with his 6.1 million Twitter followers.
But last week, before embarking on a long day of media exposure to promote his new film, "No Strings Attached," Kutcher embodied none of these characteristics. He'd just returned from a vacation with Moore, where they stayed on a yacht on St. Barts. That morning, he'd dropped off one of her daughters at school. In lieu of breakfast, he'd picked up an iced coffee. He was serious -- sedate, even -- speaking at length about his charity work to end sex trafficking and his intentions for his acting career. He never cracked a single joke.
He's deeper than...