2U David Guetta feat. Justin Bieber
8 June 2013, 12:22
The 'Carry You' stars have taken to the stage ahead of their performance in London tomorrow.
Union J are among the first stars to take to the stage to soundcheck at Wembley Stadium for their Summertime Ball 2013 performance.
The former X Factor stars were in high spirits as they enjoyed their time on stage in the glorious North London sunshine.
The boy have also been taking to Twitter to reveal their excitement ahead of tomorrow's big day.
"On way to summertime ball rehearsals :) super excited to perform at wembley stadium tommorow!!!!! Josh x," the group wrote.
Speaking to Capital earlier this week, the four-piece also declared it a "privilege" to be performing and have been wished well by the likes of this year's opening act The Wanted.
Other stars appearing across the day include Taylor Swift, Lawson, Robbie Williams, Jessie J and Will.i.am.
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.