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"I never thought Jason would ever date someone with a kid," a Segel pal says in the new issue of Us Weekly. "But he's taking everything in stride. He's ready to be a grown-up."
But the kid isn't a problem because she actually "loves Jason," a source adds of the funnyman's connection to his girlfriend's 6-year-old daughter. Indeed, it wasn't a fluke that Segel was spotted playing with the little girl at a Brooklyn park last month.
"Jason knows how to entertain children. You can't be that obsessed with puppets and not learn a few things!"
The Five-Year Engagement star, 32, and the Oscar-nominated My Week with Marilyn actress, 31, met through Matilda's godmother, Williams' best friend Busy Philipps -- who worked with both actors early in her career. They began taking their relationship public in the past couple of months.
Most recently, the pair was spotted being openly affectionate at the Five-Year Engagement premiere and the Tribeca Film Festival, where both Williams and Segel were promoting their latest film projects.
"She's fallen for him hard," a source close to Williams tells Us. "She's really giving this a shot."