It's based on the number of followers on social media.
Westmeath's Niall Horan is one of the most influential people in the world.
The Mullingar singer is the only Irish star to make the list of 100 celebrities, musicians and sports personalities.
American singer Ariana Grande took the top spot with 329 million followers on social media.
The former One Direction star is ranked at 61, with 69 million followers across Instagram, Twitter, YouTube and TikTok.
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