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18 February 2013, 11:45 | Updated: 18 February 2013, 11:56
The 'Little Things' singer gave one fan the "best night" of her life by surprising her on her special day.
One Direction star Harry Styles surprised one of his biggest fans over the weekend when he turned up to serenade her at her birthday party.
The 'Kiss You' singer made an appearance at the 18th birthday of Olivia McKee, to the surprise of both her and her 100 party guests, and planted a big kiss on the stunned fan's cheek.
Harry then led the party goers at Great John Street Hotel in Manchester in a singalong of Happy Birthday, before giving the One Direction fan a big hug to mark her special day.
"Oh my god he kissed me. I love Harry. Best night of my life," Olivia tweeted after her big night.
Check out a picture of Harry posing with birthday girl Olivia below (Credit: Twitter):
The One Direction star's surprise appearance had been organised by Olivia's millionaire father Noel, although a spokesperson for the boy band star claims he is a friend of the family and had not been paid to attend.
One Direction are now preparing to launch their 'Take Me Home' world tour this weekend (23rd February) at London's O2 Arena, after performing new single 'One Way Or Another' at the BRIT Awards 2013 on Wednesday (20th February).
Watch Harry Styles surprising one of his biggest fans at her birthday party over the weekend below: