Justin Bieber called hip-hop mogul Sean “Diddy” Combs’ bluff when he promised to give the pop star the keys to his white Lamborghini on Bieber’s 16th birthday. Back in March, the blond-haired singer told ‘People’ Magazine, “He [Diddy] said when I turn 16 he was going to give me his Lamborghini. But we all know Diddy’s not gonna give me his Lamborghini. He’s all talk.” (continue reading…)