We Day kicks off in London

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STORY: Celebrities and activists including Malala Yousafzai, Clive Owen and Sir Richard Branson have all arrived for 'We Day UK' in London on Friday (March 7).

The event, which aims to promote global youth empowerment, is being held at Wembley Arena and will feature performances from Oscar winning star Jennifer Hudson and British musician Ellie Goulding.

Prince Harry is due to give a speech to an estimated 12,000 young people at the event.

Also seen arriving at the event was Prince Harry's girlfriend Cressida Bonas, making 'We Day UK' the very first time that she has attended one of the Prince's official engagements.

Other speakers include former U.S. Vice President Al Gore and Pakistani teenage activist Malala Yousafzai.

'We Day' is run by the international charity Free The Children, in partnership with Virgin Atlantic and Barclays.

The event, which is the first 'We Day' to be held outside of North America, wi