Usher blasts 'mean' P Diddy

R&B superstar Usher has launched a scathing attack on hip-hop mogul Sean 'P Diddy' Combs for failing to offer him financial help in his time of desperate need.

The chart-topping singer turned to Combs when he was a teenager starting out in the music business, but remains resentful the rapper snubbed him after gaining his trust.