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31 July 2012, 14:23 | Updated: 31 July 2012, 14:48
The 'One Thing' singer was said to be in "great spirits" while belting out hits at the celebrity wedding.
One Direction star Niall Horan has been described as the life of the party at Rochelle Wiseman and Marvin Humes' wedding over the weekend, with one guest claiming he treated fellow guests to some renditions of the band's biggest hits.
'What Makes You Beautiful' star Niall attended the wedding of The Saturdays star Rocehelle to JLS member Marvin on Friday evening (27th July) alongside fellow One Direction members Liam Payne and Harry Styles, and was said to be in "great spirits" while he drank with fellow The X Factor star Olly Murs.
"Niall looked like he'd had a few and was in great spirits," a wedding guest told the Daily Star this week. "The boy loves to sing and was belting out One Direction's hits at the top of his voice.
"The guests were loving it," they added.
"What an amazing evening! Congrats to the beautiful couple marv and roch @JLSOfficial @RochelleTheSats ! Im off home! Have a great night," Niall tweeted to the newly married couple after their wedding at the weekend.
Today it was announced that One Direction will perform live at the MTV Video Music Awards in September (5th) after being nominated for both Best New Artist and Best Pop Video, as well as being linked to a performance for the closing ceremony of the London 2012 Olympics Games.
View a picture of One Direction star Niall Horan below (Credit: Getty):
One Direction have been regularly tweeting fans for the past few weeks from the recording studio while they work on the follow-up record to their 2011 debut 'Up All Night'.
Niall Horan recently promised fans the band will return with new music within the next couple of months.