Jon's CHANGE of HEART

AFTER YEARS OF SAYING HE WASN'T THE MARRYING KIND, JON HAMM POPS THE QUESTION TO ANNA OSCEOLA!

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FOR a long time, Jon Hamm was the poster boy for not tying the knot. “I don’t have the marriage chip,” the Mad Men alum insisted during his 18-year relationship with writer/director Jennifer Westfeldt. He even said he’d make a “terrible” father: “I see my friends who have children and I’m like, ‘Dude, how are you even upright, much less here at work at 6 a.m.?’ ”

Seems his attitudes have changed. Star can report the 52-year-old has popped the question to girlfriend of two years — and Fletch costar —