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An 80-year-old great grandmother was overjoyed by the sexy fireman calendar she got as a Christmas gift.

Video shows Mary Ann Davis, a great grandmother to 12, making priceless facial expressions and squealing with laughter she flips through pages of the Hamilton County firefighter calendar.

"Oh, isn't that cute," Mary Ann says as she begins to giggle uncontrollably for the next two minutes.

Granddaughter Kari Jones told an Indiana news station: "Our Grannie Annie is always full of joy and so fun to be around. We knew her reaction would be hilarious!" 

Sales from the calendar go towards the fallen Hamilton County firefighters memorial.

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