The Dublin singer was competing in the same series as the Mullingar singer.
A former X-Factor star has revealed details about Niall Horan's passage through the boot camp phase of the show in 2010.
Mary Byrne says the Mullingar man and eventual bandmates Harry, Zayn and Louis took the process in their stride.
But when it came to eliminations, the Ballyfermot vocalist says it was hard to see them go through an emotional roller coaster:
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