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12 June 2012, 09:04
The 'LaserLight' song put on her unusual voice while recording a message to all her Heartbeats at the Summertime Ball.
Jessie J has recorded a special video message for fans using her infamous 'inside a box' voice.
"Hello everybody! This is Jessie J here, and I'm inside a box!" Jessie said, while putting on the unusual voice. "I'm sending all my love to all my Heartbeats, thank you for your support! Bye!
The 'Who You Are' star performed all of her biggest hits to date at the Capital FM event, including 'LaserLight' and 'Do It Like A Dude', as well as introducing special guests Rizzle Kicks on stage to perform 'Price Tag' with her.
After performing live, Jessie also revealed to Capital that she definitely hopes to work with Katy Perry at some point in the future, and says she is a big fan of the 'Teenage Dream' star.
Watch Jessie J's special message to her 'heartbeats' said in her 'inside a box' voice below: