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9 June 2013, 20:20 | Updated: 9 June 2013, 20:31
The X Factor UK stars made a splash with their Summertime Ball debut and threw in an amazing duet for good measure.
Union J made their debut at the Capital FM Summertime Ball 2013 debut today (9th June) and threw a surprise cover into their set to thrill the Wembley Stadium audience.
Jaymi, Josh, JJ and George were greeted with huge cheers throughout their short, but explosive performance as the #JCats came out in force to support the boys.
Performance Review: Union J have had a world-wind twelve months after their huge success on The X Factor last year, and made good on their promise to be the next big UK band by wowing the crowd with their first ever performance at the Ball. The boys even threw in a curveball when they kicked off their set with Carly Rae Jepsen's 'Call Me Maybe' hit, making sure everyone at the venue joined them in dancing along with the 'Call Me' hang sign.
The band then launched straight into brand new debut single 'Carry You', already a massive hit on the Vodafone Big Top 40, which got everyone singing along as the boys jumped around and made sure the crowd was right there with them, performing from up high on a giant stage in the centre of Wembley Stadium.
The Song When Everyone Was Fangirling: 'Carry You' - This song was the moment the #JCats made their mark on Wembley and belted out the words to Union J's newly released debut single along with the four boys.
What Was Union J Wearing: Josh rocked a denim vest, JJ went monochrome in a white and black t-shirt, Jaymi core a colourful t-shirt and black vest combination while George kept the summer theme going in a bright orange t-shirt.
The Most OMG Moment: When Union J kicked off their set with a surprise cover of the unstoppable Carly Rae Jepsen hit 'Call Me Maybe', emerging from a giant stage right in the centre of the Wembley Stadium pitch.
View From The Vine:
'Call Me Maybe'
In A Tweet: "The moment @UnionJWorld got 80,000 people to all #swoon at once..."
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.