Question: why has Mullingar man Niall Horan ended up on a list of Britain's richest young stars?

Niall Horan has many millions of fans - and they likely all know that the singer is a proud Irishman. 

However, the music star has been named as one of the top 30 richest stars under the age of 30 in the UK. The County Westmeath-native was listed as having a staggering fortune of $59m (€52m).

On the list of budding multi-millionaires, Horan was joined by his one-time One Direction bandmates. Harry Styles made the list in fourth place, with an estimated net worth of $73m (€65m). Louis Tomlinson, Liam Payne, and Zayn Malik all made the list too.

Read more: Could One Direction millionaire Niall Horan lose it all?

I’m raffling off the shirt I wore at last year’s Jingle Bell Ball to celebrate @raysofsunshine’s 15th Birthday ! I love being an ambassador for this charity and hope you’ll support them by buying a raffle ticket . Enter here: https://t.co/SAKo74IdeI 🎉 #15YearsOfSunshine pic.twitter.com/RDxqtqn4qV

— Niall Horan (@NiallOfficial) October 19, 2018

The annual list, compiled by Heat Magazine, notes that 25-year-old Horan made his fortune through both his stint in the global chart-topping boyband and his solo career.

"Since cutting ties with Simon Cowell, Niall has signed a £4m ($5m) record deal, had a US #1 album, while he's predicted to make €10m ($11m) from his 81-date world tour. Owns a glass-fronted London apartment which comes with its own penthouse cocktail bar. And why not? He can afford it."

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Camden NJ 📸 @christiantierney

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As for why he is included as the sole Irish person amongst Britons? Well, they do have a habit of 'claiming' successful Irish talent as their own when it suits!

Singer Adele ranked first with an estimated worth of $201m as the richest, young British star. Ed Sheeran followed in close second, with $122m 'in the bank.'

Read More: Niall Horan takes on Donald Trump on Twitter

WATCH: Humble Niall Horan nails performance with top Irish orchestra

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Niall Horan attends the Horan And Rose Charity Event held at The Grove on June 23, 2018, in Watford, England. NEIL P. MOCKFORD/GETTY IMAGES