Pink, Girls Aloud and The Wanted are all among the stars set for day two of the festive spectacular at London's O2 Arena.
The Wanted On Scooter Braun Signing K-Pop Star PSY: "He's A Clever Guy"
The 'I Found You' stars say they were confused when they first heard 'Gangnam Style'.
The Wanted's Tom Parker has revealed he was played PSY's worldwide hit 'Gangnam Style' six months ago by the K-Pop star's manager Scooter Braun and initially thought he was joking about launching the song globally.
The 'Glad You Came' singer says he was showed 'Gangnam Style' by Scooter, who also manages Justin Bieber and The Wanted's career stateside, during a barbecue while the UK band were out in America earlier this year.
"I was round his gaff over six months ago having a barbecue," Tom revealed, of the first time he heard PSY's 'Gangnam Style' song. "[Scooter] showed me a YouTube clip of the song and I said, 'Are you having a laugh?'
"He said, "It'll be huge", but I didn't believe him," Tom added. "He's a clever guy."
The 'Glad You Came' singer also said that Labrinth and Emeli Sande's new song is one of his favourite releases in recent months, fresh from it securing the number one spot on the Vodafone Big Top 40 last month.
"The Labrinth, Emeli Sande single is one of the best songs of the year. I'm a massive fan of his," Tom added.
View a picture of PSY arriving in London this month below:
This week the 'I Found You' singers were confirmed for the performance line-up of the American Music Awards 2012, which take place this Sunday (18th November) from Los Angeles, and the band will also perform on the Sunday (9th December) of the Capital FM Jingle Bell Ball 2012 .
The Wanted have recently hinted at a possible March 2013 release for their third studio album.