Duff, soon to turn only 21 on the 28th of September, was seen wearing a shiny bauble on her her left ring finger. This confirms nothing and Duff's camp isn't opening up, but remember that Comrie gifted Hil with a $100,000 Mercedes for her birthday last year and they'd only been dating a couple of months at the time. So either an expensive early birthday present or a tether to monotony. Time will tell which.
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