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9 June 2012, 21:38 | Updated: 9 June 2012, 21:42
The Canadian singer-songwriter surprised fans with a performance of her hit single 'Call Me Maybe'.
Carly Rae Jepsen was revealed as Justin Bieber's special guest at the Capital FM Summertime Ball 2012 today (9th June) and shocked the crowds when she made her way out on stage at Wembley Stadium.
After the 'Boyfriend' singer's energetic crowd-pleasing set Justin introduced his protege, who is signed to his label Schoolboy Records, revealing Carly as his special guest for the night.
Earlier today Justin hinted he had bought a special guest with him to the Capital FM event after teasing the news on Twitter, causing worldwide speculation amongst the 'Never Say Never' singer's fans.
Carly Rae Jepsen arrived on stage at Wembley Stadium where she then performed her recent Vodafone Big Top 40 number one single 'Call Me Maybe' to the excitement of the 80,000 strong audience.
The Canadian also joined the star on stage and was dancing around the smash hit single.
Justin Bieber's set at the Capital FM Summertime Ball 2012 saw him perform hits like 'Somebody To Love', 'Baby' and new song 'All Around The World'.
Capital FM is coming live from the Summertime Ball at London's Wembley Stadium on 9th June.
Keep your eye on the ball by heading to our Summertime Ball area for all the latest news, photo galleries and interviews from this year's event.