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."

But Diddy, known for shelling out extravagant gifts, made good on his promise. Bieber was spotted in L.A. this week driving the white Lamborghini Spyder with friend Sean Kingston riding shot gun. While out cruising the streets, the young duo stopped by Pinkberry, a popular frozen yogurt shop, hours before Bieber's concert at the Nokia Theater that evening.

Bieber is the second teenager that the Bad Boy CEO has given a flashy ride to this year. In January, he gave his son, Justin Dior, a $360K Maybach for his 16th birthday.

Justin's mentor, Usher, also bought him a black Range Rover in March for his birthday.