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8 June 2013, 14:13
The 'Carry You' stars speak ahead of their performance at Wembley Stadium on Sunday.
Union J have been speaking to Capital FM ahead of their debut at the Summertime Ball on Sunday (9th June).
The former X Factor winners said it's a "dream" and a "privilege" to be on the biggest line-up ever at the 2013 event.
George declared: "It's more then I've ever dreamed of."
JJ added: "I think literally it will hit me and it will hit us once we're there. It's an absolute privilege.
"It's incredible, c'mon it's the Summertime Ball," added George. "It's mental."
Jaymi also spoke about the moment the band found at about the venue it was being held at and his shock.
"When we got told it was like Capital's Summertime Ball is at Wembley, we were like, oh, we loved performing at Wembley [On the X Factor tour]. And then someone was like, 'No it's the stadium and we were like 'what?'," he said.
Listen to Union J speaking about performing at this year's Summertime Ball below:
Other stars on the line-up include Robbie Williams, Taylor Swift, Jessie J, Will.i.am and The Wanted.
This year will also feature a special guest host as Justin Timberlake takes hold of proceedings.
Keep it Capital for all the action from the Summertime Ball.
On Capitalfm.com, we're bringing you all the latest news, gossip, pictures, videos and performances from the event, and stay tuned to our live blog for the best backstage action.
On Twitter, keep it @CapitalOfficial using the hashtag #CapitalSTB and download the Capital App to watch all the live performances.