The Irish Cancer Society says it wants to find out who started the "No make-up selfie" craze which has seen €200,000 raised in just 24 hours.
The trend has caught on with Facebook and Twitter users around the world.
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Make-up artist Emma Stevenson poses without any
People taking part post their bare faced picture online, donate cash to a cancer charity and nominate others to do likewise.
The money raised will fund breast cancer services and research.
Retail manager Sabrina Loonam goes without
The ICS says it has never happened before and they would love to see it become an annual event.
Head of Fundraising Mark Mellett says he is stunned by its success and wants to thank whoever started the trend.
