Justin Bieber in LA: Driving Diddy's Lamborghini, in concert

Justin Bieber hit the City of Angels for a concert on July 20.

But before performing his latest stop on the My World Tour, he took Diddy's Lamborghini out for a spin, reports the Daily Mail.

Wait, what?

Apparently, a year ago, Sean "Diddy" Combs promised a 15-year-old Bieber that he could drive the rapper-producer's white Lamborghini once he turned 16. Biebs turned sweet 16 in March, so once he hit LA, Diddy made good on his promise.