Foster The People frontman Mark Foster begged security guards to let him back into a Prince concert after he was kicked out for using his cell phone during the show.

The rocker attended a surprise gig by the Purple Rain hitmaker at the tiny Sayers Club in Hollywood on Tuesday (23Oct12) but he failed to comply with a mandatory mobile phone check-in on the door.

Midway through the concert, venue staff spotted Foster with the device and booted him out of the concert - but he was allowed back in after spending two minutes begging to be re-admitted and showing security bosses there were no photos from the show on his phone.

In film footage obtained by Tmz.com, Foster can be seen urging a security boss to allow him back inside. Eventually he was re-admitted to the concert after agreeing to check in his cell phone.