Chloe Sayers was taken to the band's Friday night show by her aunt Muriel as a 12th birthday present, along with a cousin and a friend.
Her devoted aunt smuggled a banner in down her trousers asking the band to wish her niece a happy birthday from the stage, to much hilarity among the girls.
Muriel Sayers said her cheek paid off big time.
"Chloe made four flipchart-size posters which said 'Niall, Please say, Happy Birthday, Chloe Sayers'.
"Security Guards were taking posters off the girls at the door so I hid her's down my trousers, which she thought was hilarious.
"When the band sang Little Things, they came above our heads and we held up the posters in a line to show the message.
"Niall, Harry and Liam saw it and smiled down at her but didn't say anything.
"Niall looked directly at me and I made a begging gesture and pointed to Chloe. "He looked directly at Chloe and gave her the thumbs up – but still nothing was said. Chloe was just so pleased that he had seen it."
The devoted auntie – who queued for 23 hours to get her niece a ticket right at the front said they thought that was as good as it got, but Chloe was in for a bigger thrill.
"Two songs later, the lights went up and Liam looked directly down at us and said, 'Has anyone got banners?'. The four of us held up the message and Liam said 'That's a long banner – look, that's for you Niall'.
"Niall came over, looked directly at Chloe and shouted 'Happy Birthday Chloe Sayers'.
"Well, the posters got flung in the air, Chloe started crying and the rest of us started screaming and jumping up and down – even me and I'm 49.
"I shouted up to them 'Thank you boys, you've made her night'.
"Liam smiled down at me and then said 'Happy Birthday Chloe'.
As for Chloe, she is still crying tears of joy.
In her own words: "It was the best night of my life."
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? email@example.com
You exude grace and charm. Don't be surprised when everybody wants to be seen with you. You create an aura of glamour wherever you go. If you're looking for love, you could find it with someone who has recently moved to the area. Offer to show this newcomer all the hotspots. Are you already in a relationship? You and your amour will benefit from a mini-break. Visit a nearby city or village that appeals to you both. You'll enjoy spending quality time together.More