If you're the fan who sang the band's biggest hit at the London Royal Festival Hall last weekend, get in touch...

NME.COM are offering a reward – can you help us contact the COLDPLAY fan who sung ‘YELLOW’ at the band’s ROYAL FESTIVAL HALL show over the weekend?

As reported earlier on NME.COM, there was drama towards the end of the gig (June 22) as the band began their hit ‘Yellow’. Huge swathes of the all-seated auditorium suddenly stood up and ran to the front of the stage with one young man breaching security and jumping up next to the band.

As security guards attempted to catch the stage invader and haul him off, the band intervened and told them to leave him be. The interloper then grabbed the microphone from Chris Martin and proceeded to sing the song himself.

NME.COM would love to speak to the invader. If you are the man who got up on stage, or know how to contact him, please e-mail news@nme.com , or call the NME news desk. We are offering a reward.

Coldplay continue their UK tour, which leads up to a massive headline appearance at this weekend’s Glastonbury Festival on June 28.