N-DUBZ star DAPPY was the victim of an April Fool's prank during the band's book signing on Thursday (01Apr10) - police turned up and pretended to question him.
The U.K. hip-hop group launched Against All Odds at a shopping centre in Essex, south-east England and signed copies for a crowd of loyal fans.
But Dappy - real name Dino Contostavlos - was in for a shock when cops turned up and told him they needed to speak to him privately.
The star, who has previously been convicted of assault, was mystified as to why the officials were targeting him - until they announced it was an April Fool's Day prank, according to Britain's The Sun.