Sean "Diddy" Combs was hurt when the car he was travelling in was hit by another vehicle in front of the Beverly Hills Hotel.
The hip-hop and fashion mogul complained of pain but was not taken to hospital.
Lt Lincoln Hoshino of Beverly Hills police said Combs was a passenger in a Cadillac Escalade SUV on Sunset Boulevard yesterday when a Lexus saloon turned left in front of it and the vehicles collided.
Combs said he would seek his own medical attention, Lt Hoshino said. No-one from either vehicle needed hospital treatment.
A phone message left for Combs' publicist was not immediately returned and Combs made no mention of the crash on his often-updated Twitter account.
Photos posted on celebrity website TMZ showed the Escalade's bump.