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WHADDYA KNOW ABOUT TAT

Lawyer, writer, philanthropist . . . tattoo aficionado?

Caroline Kennedy, who is interested in becoming New York’s next senator, doesn’t just have politics running through her veins – she also has ink adorning her arm.

The 51-year-old Upper East Sider sports a small butterfly tattoo on her inner right arm, as this photo from last summer’s Democratic convention shows.

Kennedy got the tattoo while vacationing with her family in Asia during the late 1980s.

During a night out in Hong Kong, Caroline, her brother, John F. Kennedy Jr., and her cousins Edward “Teddy” Kennedy Jr., 47, and Kara Anne Kennedy, 48, challenged one another with a mischievous dare, a source said, noting that the group had consumed a few drinks.

The boys challenged the girls to get a late-night “tat” at a nearby parlor.

Caroline and Kara went first and emerged “bruised and bloodied,” emblazoned with butterflies on their arms.

But when it came time for Teddy and John Jr. to reciprocate, the men “chickened out,” refusing to go through with the dare, the source said.

A call to Kennedy for comment about the tantalizing tattoo was not returned.

mkronfeld@nypost.com