One Direction delight festival fans
One Direction sent screaming girls into hysterics when they took to the stage at the iTunes Festival.
Fans squealed and cried as the boyband took time out of their hit-packed set at London's Roundhouse to answer questions from devotees sent in via Twitter.
After being asked what were each other's defining qualities, Zayn told the audience Harry is sexy, Liam said Niall is cute, while Louis said Zayn is kind and Niall revealed Louis is spontaneous.
Harry's description of Liam was inaudible over the screams of enraptured fans.
The boys were also quizzed about what they would change their names to given the chance, prompting Harry to reveal he would like to be called Dave.
Responding to questions sent in from places as far away as Japan, America and Italy, the band also took up the request to perform impressions of each other, as well as the opening rap from the TV show Fresh Prince Of Bel Air.
During the concert the boys performed their biggest hits, including You Don't Know You're Beautiful, One Thing and Moments, written for them by Ed Sheeran, as well as songs they performed while contestants on the X Factor, including Use Somebody, Valerie and I Gotta Feeling.
Addressing the band's storming success in America, Louis told fans: "We have spent time outside of the UK and it is incredible to be back in London."
Niall added: "You have helped us so much. This is the best part of what we do, performing for you guys. "Hopefully we will see some of you sexy people at our tours."
Muse, Alicia Keys and Lana Del Rey are among the acts to play the iTunes Festival later this month.