Jessie J Joined By Brandy And Dizzee Rascal During iTunes Festival 2013 Show

Lawson were also on the line-up last night at the Roundhouse in Camden.

Jessie J was joined on stage by Dizzee Rascal and Brandy during her iTunes Festival 2013 performance.

The 'Domino' singer debuted new material from her latest album 'Alive' and was in celebratory mode as she hit the stage in Camden's Roundhouse.

Opening with 'Price Tag' the set also included 'Do It Like A Dude' and 'Excuse My Rude'.

"When I turned 25, I understood my responsibility as an artist," she told the audience during one of the more emotional moments of the evening.

Brandy and Jessie performed their collaboration 'Conquer The World' with Dizzee jumping on stage for his verse of 'Wild' later in the show.